Dreams are successions of images, ideas, emotions, and sensations that occur involuntarily in the mind during certain stages of sleep. The content and purpose of dreams are not definitively understood, though they have been a topic of scientific speculation, as well as a subject of philosophical and religious interest, throughout recorded history. The scientific study of dreams is called oneirology.
Dreams mainly occur in the rapid-eye movement (REM) stage of sleep—when brain activity is high and resembles that of being awake. REM sleep is revealed by continuous movements of the eyes during sleep. At times, dreams may occur during other stages of sleep. However, these dreams tend to be much less vivid or memorable.
The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes. People are more likely to remember the dream if they are awakened during the REM phase. The average person has three to five dreams per night, but some may have up to seven dreams in one night. The dreams tend to last longer as the night progresses. During a full eight-hour night sleep, most dreams occur in the typical two hours of REM.
In modern times, dreams have been seen as a connection to the unconscious mind. They range from normal and ordinary to overly surreal and bizarre. Dreams can have varying natures, such as frightening, exciting, magical, melancholic, adventurous, or sexual. The events in dreams are generally outside the control of the dreamer, with the exception of lucid dreaming, where the dreamer is self-aware. Dreams can at times make a creative thought occur to the person or give a sense of inspiration.
Opinions about the meaning of dreams have varied and shifted through time and culture. The earliest recorded dreams were acquired from materials dating back approximately 5000 years, in Mesopotamia, where they were documented on clay tablets. In the Greek and Roman periods, the people believed that dreams were direct messages from one and/or multiple deities, from deceased persons, and that they predicted the future. Some cultures practiced dream incubation with the intention of cultivating dreams that are of prophecy.
Sigmund Freud, who developed the discipline of psychoanalysis, wrote extensively about dream theories and their interpretations in the early 1900s. He explained dreams as manifestations of our deepest desires and anxieties, often relating to repressed childhood memories or obsessions. In The Interpretation of Dreams (1899), Freud developed a psychological technique to interpret dreams and devised a series of guidelines to understand the symbols and motifs that appear in our dreams.
- 1 Cultural meaning
- 2 Dynamic psychiatry
- 3 The neurobiology of dreaming
- 4 Dreams in animals
- 5 Neurological theories of dreams
- 6 Psychological theories of dreams
- 7 Dream content
- 8 Dream interpretations
- 9 Other associated phenomena
- 9.1 Incorporation of reality
- 9.2 Apparent precognition of real events
- 9.3 Lucid dreaming
- 9.4 Dreams of absent-minded transgression
- 9.5 Recalling dreams
- 9.6 Déjà vu
- 9.7 Daydreaming
- 9.8 Hallucination
- 9.9 Nightmares
- 9.10 Night terrors
- 10 See also
- 11 References
- 12 Further reading
- 13 External links
The Dreaming is a common term within the animist creation narrative of indigenous Australians for a personal, or group, creation and for what may be understood as the "timeless time" of formative creation and perpetual creating.
The Sumerians in Mesopotamia left evidence of dreams dating back to 3100 BC. According to these early recorded stories, gods and kings, like the 7th century BC scholar-king Assurbanipal, paid close attention to dreams. In his archive of clay tablets, some accounts of the story of the legendary king Gilgamesh were found.
The Mesopotamians believed that the soul, or some part of it, moves out from the body of the sleeping person and actually visits the places and persons the dreamer sees in their sleep. Sometimes the god of dreams is said to carry the dreamer. Babylonians and Assyrians divided dreams into "good," which were sent by the gods, and "bad," sent by demons - They also believed that their dreams were omens and prophecies.
In ancient Egypt, as far back as 2000 BC, the Egyptians wrote down their dreams on papyrus. People with vivid and significant dreams were thought blessed and were considered special. Ancient Egyptians believed that dreams were like oracles, bringing messages from the gods. They thought that the best way to receive divine revelation was through dreaming and thus they would induce (or "incubate") dreams. Egyptians would go to sanctuaries and sleep on special "dream beds" in hope of receiving advice, comfort, or healing from the gods.
In Chinese history, people wrote of two vital aspects of the soul of which one is freed from the body during slumber to journey in a dream realm, while the other remained in the body, although this belief and dream interpretation had been questioned since early times, such as by the philosopher Wang Chong (27-97). The Indian text Upanishads, written between 900 and 500 BC, emphasize two meanings of dreams. The first says that dreams are merely expressions of inner desires. The second is the belief of the soul leaving the body and being guided until awakened.
The Greeks shared their beliefs with the Egyptians on how to interpret good and bad dreams, and the idea of incubating dreams. Morpheus, the Greek god of dreams, also sent warnings and prophecies to those who slept at shrines and temples. The earliest Greek beliefs about dreams were that their gods physically visited the dreamers, where they entered through a keyhole, exiting the same way after the divine message was given.
Antiphon wrote the first known Greek book on dreams in the 5th century BC. In that century, other cultures influenced Greeks to develop the belief that souls left the sleeping body. Hippocrates (469-399 BC) had a simple dream theory: during the day, the soul receives images; during the night, it produces images. Greek philosopher Aristotle (384-322 BC) believed dreams caused physiological activity. He thought dreams could analyze illness and predict diseases. Marcus Tullius Cicero, for his part, believed that all dreams are produced by thoughts and conversations a dreamer had during the preceding days. Cicero's Somnium Scipionis described a lengthy dream vision, which in turn was commented on by Macrobius in his Commentarii in Somnium Scipionis.
In Abrahamic religions
In Judaism, dreams are considered part of the experience of the world that can be interpreted and from which lessons can be garnered. It is discussed in the Talmud, Tractate Berachot 55-60.
The ancient Hebrews connected their dreams heavily with their religion, though the Hebrews were monotheistic and believed that dreams were the voice of one God alone. Hebrews also differentiated between good dreams (from God) and bad dreams (from evil spirits). The Hebrews, like many other ancient cultures, incubated dreams in order to receive divine revelation. For example, the Hebrew prophet Samuel would "lie down and sleep in the temple at Shiloh before the Ark and receive the word of the Lord." Most of the dreams in the Bible are in the Book of Genesis.
Christians mostly shared their beliefs with the Hebrews and thought that dreams were of a supernatural character because the Old Testament includes frequent stories of dreams with divine inspiration. The most famous of these dream stories was Jacob's dream of a ladder that stretches from Earth to Heaven. Many Christians preach that God can speak to people through their dreams.
Iain R. Edgar has researched the role of dreams in Islam. He has argued that dreams play an important role in the history of Islam and the lives of Muslims, since dream interpretation is the only way that Muslims can receive revelations from God since the death of the last Prophet Mohammed.
Dreams and philosophical realism
The first recorded mention of the idea was by Zhuangzi, and it is also discussed in Hinduism, which makes extensive use of the argument in its writings. It was formally introduced to Western philosophy by Descartes in the 17th century in his Meditations on First Philosophy. Stimulus, usually an auditory one, becomes a part of a dream, eventually then awakening the dreamer.
Postclassical and medieval history
Some Indigenous American tribes and Mexican civilizations believe that dreams are a way of visiting and having contact with their ancestors. Some Native American tribes used vision quests as a rite of passage, fasting and praying until an anticipated guiding dream was received, to be shared with the rest of the tribe upon their return.
The Middle Ages brought a harsh interpretation of dreams. They were seen as evil, and the images as temptations from the devil. Many believed that during sleep, the devil could fill the human mind with corrupting and harmful thoughts. Martin Luther, founder of Protestantism, believed dreams were the work of the Devil. However, Catholics such as St. Augustine and St. Jerome claimed that the direction of their lives was heavily influenced by their dreams.
Dreams and dark imaginings are the theme of Goya's etching The Sleep of Reason Produces Monsters. There is a painting by Salvador Dalí that depicts this concept, titled Dream Caused by the Flight of a Bee around a Pomegranate a Second Before Awakening (1944). Henri Rousseau's last painting was The Dream. Le Rêve ("The Dream") is a 1932 painting by Pablo Picasso.
Dream frames were frequently used in medieval allegory to justify the narrative; The Book of the Duchess and The Vision Concerning Piers Plowman are two such dream visions. Even before them, in antiquity, the same device had been used by Cicero and Lucian of Samosata.
They have also featured in fantasy and speculative fiction since the 19th century. One of the best-known dream worlds is Wonderland from Lewis Carroll's Alice's Adventures in Wonderland, as well as Looking-Glass Land from its sequel, Through the Looking-Glass. Unlike many dream worlds, Carroll's logic is like that of actual dreams, with transitions and flexible causality.
Other fictional dream worlds include the Dreamlands of H. P. Lovecraft's Dream Cycle and The Neverending Story's world of Fantasia, which includes places like the Desert of Lost Dreams, the Sea of Possibilities and the Swamps of Sadness. Dreamworlds, shared hallucinations and other alternate realities feature in a number of works by Phillip K. Dick, such as The Three Stigmata of Palmer Eldritch and Ubik. Similar themes were explored by Jorge Luis Borges, for instance in The Circular Ruins.
In popular culture
Modern popular culture often conceives of dreams, like Freud, as expressions of the dreamer's deepest fears and desires. The film version of The Wizard of Oz (1939) depicts a full-color dream that causes Dorothy to perceive her black-and-white reality and those with whom she shares it in a new way. In films such as Spellbound (1945), The Manchurian Candidate (1962), Field of Dreams (1989), and Inception (2010), the protagonists must extract vital clues from surreal dreams.
Most dreams in popular culture are, however, not symbolic, but straightforward and realistic depictions of their dreamer's fears and desires. Dream scenes may be indistinguishable from those set in the dreamer's real world, a narrative device that undermines the dreamer's and the audience's sense of security and allows horror film protagonists, such as those of Carrie (1976), Friday the 13th (1980) or An American Werewolf in London (1981) to be suddenly attacked by dark forces while resting in seemingly safe places.
In speculative fiction, the line between dreams and reality may be blurred even more in the service of the story. Dreams may be psychically invaded or manipulated (Dreamscape, 1984; the Nightmare on Elm Street films, 1984–2010; Inception, 2010) or even come literally true (as in The Lathe of Heaven, 1971). In Ursula K. Le Guin's book, The Lathe of Heaven (1971), the protagonist finds that his "effective" dreams can retroactively change reality. Peter Weir's 1977 Australian film The Last Wave makes a simple and straightforward postulate about the premonitory nature of dreams (from one of his Aboriginal characters) that "... dreams are the shadow of something real". In Kyell Gold's novel Green Fairy from the Dangerous Spirits series, the protagonist, Sol, experiences the memories of a dancer who died 100 years before through Absinthe induced dreams and after each dream something from it materializes into his reality. Such stories play to audiences' experiences with their own dreams, which feel as real to them.
Freudian view of dreams
In the late 19th century, psychotherapist Sigmund Freud developed a theory that the content of dreams is driven by unconscious wish fulfillment. Freud called dreams the "royal road to the unconscious." He theorized that the content of dreams reflects the dreamer's unconscious mind and specifically that dream content is shaped by unconscious wish fulfillment. He argued that important unconscious desires often relate to early childhood memories and experiences. Freud's theory describes dreams as having both manifest and latent content. Latent content relates to deep unconscious wishes or fantasies while manifest content is superficial and meaningless. Manifest content often masks or obscures latent content.
In his early work, Freud argued that the vast majority of latent dream content is sexual in nature, but he later moved away from this categorical position. In Beyond the Pleasure Principle he considered how trauma or aggression could influence dream content. He also discussed supernatural origins in Dreams and Occultism, a lecture published in New Introductory Lectures on Psychoanalysis.
Jungian and other views of dreams
Carl Jung rejected many of Freud's theories. Jung expanded on Freud's idea that dream content relates to the dreamer's unconscious desires. He described dreams as messages to the dreamer and argued that dreamers should pay attention for their own good. He came to believe that dreams present the dreamer with revelations that can uncover and help to resolve emotional or religious problems and fears.
Jung wrote that recurring dreams show up repeatedly to demand attention, suggesting that the dreamer is neglecting an issue related to the dream. He believed that many of the symbols or images from these dreams return with each dream. Jung believed that memories formed throughout the day also play a role in dreaming. These memories leave impressions for the unconscious to deal with when the ego is at rest. The unconscious mind re-enacts these glimpses of the past in the form of a dream. Jung called this a day residue. Jung also argued that dreaming is not a purely individual concern, that all dreams are part of "one great web of psychological factors."
Fritz Perls presented his theory of dreams as part of the holistic nature of Gestalt therapy. Dreams are seen as projections of parts of the self that have been ignored, rejected, or suppressed. Jung argued that one could consider every person in the dream to represent an aspect of the dreamer, which he called the subjective approach to dreams. Perls expanded this point of view to say that even inanimate objects in the dream may represent aspects of the dreamer. The dreamer may, therefore, be asked to imagine being an object in the dream and to describe it, in order to bring into awareness the characteristics of the object that correspond with the dreamer's personality.
The neurobiology of dreaming
Accumulated observation has shown that dreams are strongly associated with REM rapid eye movement sleep, during which an electroencephalogram (EEG) shows brain activity that, among sleep states, is most like wakefulness. Participant-remembered dreams during NREM sleep are normally more mundane in comparison. During a typical lifespan, a person spends a total of about six years dreaming (which is about two hours each night). Most dreams only last 5 to 20 minutes. It is unknown where in the brain dreams originate, if there is a single origin for dreams or if multiple portions of the brain are involved, or what the purpose of dreaming is for the body or mind.
During most dreams, the person dreaming is not aware that they are dreaming, no matter how absurd or eccentric the dream is. The reason for this may be that the prefrontal cortex, the region of the brain responsible for logic and planning, exhibits decreased activity during dreams. This allows the dreamer to more actively interact with the dream without thinking about what might happen, since things that would normally stand out in reality blend in with the dream scenery.
When REM sleep episodes were timed for their duration and subjects were awakened to make reports before major editing or forgetting of their dreams could take place, subjects accurately reported the length of time they had been dreaming in an REM sleep state. Some researchers have speculated that "time dilation" effects only seem to be taking place upon reflection and do not truly occur within dreams. This close correlation of REM sleep and dream experience was the basis of the first series of reports describing the nature of dreaming: that it is a regular nightly rather than occasional phenomenon, and is correlated with high-frequency activity within each sleep period occurring at predictable intervals of approximately every 60–90 minutes in all humans throughout the lifespan.
REM sleep episodes and the dreams that accompany them lengthen progressively through the night, with the first episode being shortest, of approximately 10–12 minutes duration, and the second and third episodes increasing to 15–20 minutes. Dreams at the end of the night may last as long as 15 minutes, although these may be experienced as several distinct episodes due to momentary arousals interrupting sleep as the night ends. Dream reports can be reported from normal subjects 50% of the time when they are awakened prior to the end of the first REM period. This rate of retrieval is increased to about 99% when awakenings are made from the last REM period of the night. The increase in the ability to recall dreams appears related to intensification across the night in the vividness of dream imagery, colors, and emotions.
Dreams in animals
REM sleep and the ability to dream seem to be embedded in the biology of many animals in addition to humans. Scientific research suggests that all mammals experience REM. The range of REM can be seen across species: dolphins experience minimal REM, while humans are in the middle of the scale and the armadillo and the opossum (a marsupial) are among the most prolific dreamers, judging from their REM patterns.
Studies have observed dreaming in mammals such as monkeys, dogs, cats, rats, elephants, and shrews. There have also been signs of dreaming in birds and reptiles. Sleeping and dreaming are intertwined. Scientific research results regarding the function of dreaming in animals remain disputable; however, the function of sleeping in living organisms is increasingly clear. For example, recent sleep deprivation experiments conducted on rats and other animals have resulted in the deterioration of physiological functioning and actual tissue damage.
Some scientists argue that humans dream for the same reason other amniotes do. From a Darwinian perspective dreams would have to fulfill some kind of biological requirement, provide some benefit for natural selection to take place, or at least have no negative impact on fitness. In 2000 Antti Revonsuo, a professor at the University of Turku in Finland, claimed that centuries ago dreams would prepare humans for recognizing and avoiding danger by presenting a simulation of threatening events. The theory has therefore been called the threat-simulation theory. According to Tsoukalas (2012) dreaming is related to the reactive patterns elicited by encounters with predators, a fact that is still evident in the control mechanisms of REM sleep (see below).
Neurological theories of dreams
Activation synthesis theory
In 1976 J. Allan Hobson and Robert McCarley proposed a new theory that changed dream research, challenging the previously held Freudian view of dreams as unconscious wishes to be interpreted. They assume that the same structures that induce REM sleep also generate sensory information. Hobson's 1976 research suggested that the signals interpreted as dreams originate in the brainstem during REM sleep. According to Hobson and other researchers, circuits in the brainstem are activated during REM sleep. Once these circuits are activated, areas of the limbic system involved in emotions, sensations, and memories, including the amygdala and hippocampus, become active. The brain synthesizes and interprets these activities; for example, changes in the physical environment such as temperature and humidity, or physical stimuli such as ejaculation, and attempts to create meaning from these signals, result in dreaming.
However, research by Mark Solms suggests that dreams are generated in the forebrain, and that REM sleep and dreaming are not directly related. While working in the neurosurgery department at hospitals in Johannesburg and London, Solms had access to patients with various brain injuries. He began to question patients about their dreams and confirmed that patients with damage to the parietal lobe stopped dreaming; this finding was in line with Hobson's 1977 theory. However, Solms did not encounter cases of loss of dreaming with patients having brainstem damage. This observation forced him to question Hobson's prevailing theory, which marked the brainstem as the source of the signals interpreted as dreams.
Combining Hobson's activation synthesis hypothesis with Solms' findings, the continual-activation theory of dreaming presented by Jie Zhang proposes that dreaming is a result of brain activation and synthesis; at the same time, dreaming and REM sleep are controlled by different brain mechanisms. Zhang hypothesizes that the function of sleep is to process, encode, and transfer the data from the temporary memory store to the long-term memory store. During NREM sleep the conscious-related memory (declarative memory) is processed, and during REM sleep the unconscious related memory (procedural memory) is processed.
Zhang assumes that during REM sleep the unconscious part of a brain is busy processing the procedural memory; meanwhile, the level of activation in the conscious part of the brain descends to a very low level as the inputs from the sensory systems are basically disconnected. This triggers the "continual-activation" mechanism to generate a data stream from the memory stores to flow through the conscious part of the brain. Zhang suggests that this pulse-like brain activation is the inducer of each dream. He proposes that, with the involvement of the brain associative thinking system, dreaming is, thereafter, self-maintained with the dreamer's own thinking until the next pulse of memory insertion. This explains why dreams have both characteristics of continuity (within a dream) and sudden changes (between two dreams).
Defensive immobilization: the precursor of dreams
According to Tsoukalas (2012) REM sleep is an evolutionary transformation of a well-known defensive mechanism, the tonic immobility reflex. This reflex, also known as animal hypnosis or death feigning, functions as the last line of defense against an attacking predator and consists of the total immobilization of the animal: the animal appears dead (cf. "playing possum"). Tsoukalas claims that the neurophysiology and phenomenology of this reaction shows striking similarities to REM sleep, a fact that suggests a deep evolutionary kinship. For example, both reactions exhibit brainstem control, paralysis, sympathetic activation, and thermoregulatory changes. Tsoukalas claims that this theory integrates many earlier findings into a unified framework.
Dreams as excitations of long-term memory
Eugen Tarnow suggests that dreams are ever-present excitations of long-term memory, even during waking life. The strangeness of dreams is due to the format of long-term memory, reminiscent of Penfield & Rasmussen's findings that electrical excitations of the cortex give rise to experiences similar to dreams. During waking life an executive function interprets long-term memory consistent with reality checking. Tarnow's theory is a reworking of Freud's theory of dreams in which Freud's unconscious is replaced with the long-term memory system and Freud's "Dream Work" describes the structure of long-term memory.
Dreams for strengthening of semantic memories
A 2001 study showed evidence that illogical locations, characters, and dream flow may help the brain strengthen the linking and consolidation of semantic memories. These conditions may occur because, during REM sleep, the flow of information between the hippocampus and neocortex is reduced.
Increasing levels of the stress hormone cortisol late in sleep (often during REM sleep) cause this decreased communication. One stage of memory consolidation is the linking of distant but related memories. Payne and Nadal hypothesize these memories are then consolidated into a smooth narrative, similar to a process that happens when memories are created under stress. Robert (1886), a physician from Hamburg, was the first who suggested that dreams are a need and that they have the function to erase (a) sensory impressions that were not fully worked up, and (b) ideas that were not fully developed during the day. By the dream work, incomplete material is either removed (suppressed) or deepened and included into memory. Robert's ideas were cited repeatedly by Freud in his Die Traumdeutung. Hughlings Jackson (1911) viewed that sleep serves to sweep away unnecessary memories and connections from the day.
This was revised in 1983 by Crick and Mitchison's "reverse learning" theory, which states that dreams are like the cleaning-up operations of computers when they are off-line, removing (suppressing) parasitic nodes and other "junk" from the mind during sleep. However, the opposite view that dreaming has an information handling, memory-consolidating function (Hennevin and Leconte, 1971) is also common.
Psychological theories of dreams
Dreams for testing and selecting mental schemas
Coutts describes dreams as playing a central role in a two-phase sleep process that improves the mind's ability to meet human needs during wakefulness. During the accommodation phase, mental schemas self-modify by incorporating dream themes. During the emotional selection phase, dreams test prior schema accommodations. Those that appear adaptive are retained, while those that appear maladaptive are culled. The cycle maps to the sleep cycle, repeating several times during a typical night's sleep. Alfred Adler suggested that dreams are often emotional preparations for solving problems, intoxicating an individual away from common sense toward private logic. The residual dream feelings may either reinforce or inhibit contemplated action.
Evolutionary psychology theories of dreams
Numerous theories state that dreaming is a random by-product of REM sleep physiology and that it does not serve any natural purpose. Flanagan claims that "dreams are evolutionary epiphenomena" and they have no adaptive function. "Dreaming came along as a free ride on a system designed to think and to sleep. " Hobson, for different reasons, also considers dreams epiphenomena. He believes that the substance of dreams have no significant influence on waking actions, and most people go about their daily lives perfectly well without remembering their dreams.
Hobson proposed the activation-synthesis theory, which states that "there is a randomness of dream imagery and the randomness synthesizes dream-generated images to fit the patterns of internally generated stimulations". This theory is based on the physiology of REM sleep, and Hobson believes dreams are the outcome of the forebrain reacting to random activity beginning at the brainstem. The activation-synthesis theory hypothesizes that the peculiar nature of dreams is attributed to certain parts of the brain trying to piece together a story out of what is essentially bizarre information.
However, evolutionary psychologists believe dreams serve some adaptive function for survival. Deirdre Barrett describes dreaming as simply "thinking in different biochemical state" and believes people continue to work on all the same problems—personal and objective—in that state. Her research finds that anything—math, musical composition, business dilemmas—may get solved during dreaming. In a related theory, which Mark Blechner terms "Oneiric Darwinism," dreams are seen as creating new ideas through the generation of random thought mutations. Some of these may be rejected by the mind as useless, while others may be seen as valuable and retained.
Finnish psychologist Antti Revonsuo posits that dreams have evolved for "threat simulation" exclusively. According to the Threat Simulation Theory he proposes, during much of human evolution physical and interpersonal threats were serious, giving reproductive advantage to those who survived them. Therefore dreaming evolved to replicate these threats and continually practice dealing with them. In support of this theory, Revonsuo shows that contemporary dreams comprise much more threatening events than people meet in daily non-dream life, and the dreamer usually engages appropriately with them. It is suggested by this theory that dreams serve the purpose of allowing for the rehearsal of threatening scenarios in order to better prepare an individual for real-life threats.
According to Tsoukalas (2012) the biology of dreaming is related to the reactive patterns elicited by predatorial encounters (especially the tonic immobility reflex), a fact that lends support to evolutionary theories claiming that dreams specialize in threat avoidance and/or emotional processing.
Psychosomatic theory of dreams
Y.D. Tsai developed in 1995 a 3-hypothesis theory that is claimed to provide a mechanism for mind-body interaction and explain many dream-related phenomena, including hypnosis, meridians in Chinese medicine, the increase in heart rate and breathing rate during REM sleep, that babies have longer REM sleep, lucid dreams, etc.
Dreams are a product of "dissociated imagination," which is dissociated from the conscious self and draws material from sensory memory for simulation, with feedback resulting in hallucination. By simulating the sensory signals to drive the autonomous nerves, dreams can affect mind-body interaction. In the brain and spine, the autonomous "repair nerves," which can expand the blood vessels, connect with compression and pain nerves. Repair nerves are grouped into many chains called meridians in Chinese medicine. When some repair nerves are prodded by compression or pain to send out their repair signals, a chain reaction spreads out to set other repair nerves in the same meridian into action. While dreaming, the body also employs the meridians to repair the body and help it grow and develop by simulating very intensive movement-compression signals to expand the blood vessels when the level of growth enzymes increase.
Other hypotheses on dreaming
There are many other hypotheses about the function of dreams, including:
- Dreams allow the repressed parts of the mind to be satisfied through fantasy while keeping the conscious mind from thoughts that would suddenly cause one to awaken from shock.
- Ferenczi proposed that the dream, when told, may communicate something that is not being said outright.
- Dreams regulate mood.
- Hartmann says dreams may function like psychotherapy, by "making connections in a safe place" and allowing the dreamer to integrate thoughts that may be dissociated during waking life.
- LaBerge and DeGracia have suggested that dreams may function, in part, to recombine unconscious elements within consciousness on a temporary basis by a process they term "mental recombination", in analogy with genetic recombination of DNA. From a bio-computational viewpoint, mental recombination may contribute to maintaining an optimal information processing flexibility in brain information networks.
From the 1940s to 1985, Calvin S. Hall collected more than 50,000 dream reports at Western Reserve University. In 1966 Hall and Van De Castle published The Content Analysis of Dreams, in which they outlined a coding system to study 1,000 dream reports from college students. Results indicated that participants from varying parts of the world demonstrated similarity in their dream content. Hall's complete dream reports became publicly available in the mid-1990s by Hall's protégé William Domhoff, allowing further different analysis.
The visual nature of dreams is generally highly phantasmagoric; that is, different locations and objects continuously blend into each other. The visuals (including locations, characters/people, objects/artifacts) are generally reflective of a person's memories and experiences, but can take on highly exaggerated and bizarre forms.
In the Hall study, the most common emotion experienced in dreams was anxiety. Other emotions included abandonment, anger, fear, joy, and happiness. Negative emotions were much more common than positive ones.
The Hall data analysis shows that sexual dreams occur no more than 10% of the time and are more prevalent in young to mid-teens. Another study showed that 8% of men's and women's dreams have sexual content. In some cases, sexual dreams may result in orgasms or nocturnal emissions. These are colloquially known as wet dreams.
Color vs. black and white
A small minority of people say that they dream only in black and white. A 2008 study by a researcher at the University of Dundee found that people who were only exposed to black and white television and film in childhood reported dreaming in black and white about 25% of the time.
Relationship with medical conditions
There is evidence that certain medical conditions (normally only neurological conditions) can impact dreams. For instance, some people with synesthesia have never reported entirely black-and-white dreaming, and often have a difficult time imagining the idea of dreaming in only black and white.
Dream interpretation can be a result of subjective ideas and experiences. A recent study conducted by the Journal of Personality and Social Psychology concluded that most people believe that "their dreams reveal meaningful hidden truths". The study was conducted in the United States, South Korea and India. 74% Indians, 65% South Koreans and 56% Americans believe in Freud's dream theories.
Other associated phenomena
Incorporation of reality
During the night, many external stimuli may bombard the senses, but the brain often interprets the stimulus and makes it a part of a dream to ensure continued sleep. Dream incorporation is a phenomenon whereby an actual sensation, such as environmental sounds, is incorporated into dreams, such as hearing a phone ringing in a dream while it is ringing in reality or dreaming of urination while wetting the bed. The mind can, however, awaken an individual if they are in danger or if trained to respond to certain sounds, such as a baby crying.
The term "dream incorporation" is also used in research examining the degree to which preceding daytime events become elements of dreams. Recent studies suggest that events in the day immediately preceding, and those about a week before, have the most influence.
Apparent precognition of real events
According to surveys, it is common for people to feel their dreams are predicting subsequent life events. Psychologists have explained these experiences in terms of memory biases, namely a selective memory for accurate predictions and distorted memory so that dreams are retrospectively fitted onto life experiences. The multi-faceted nature of dreams makes it easy to find connections between dream content and real events.
In one experiment, subjects were asked to write down their dreams in a diary. This prevented the selective memory effect, and the dreams no longer seemed accurate about the future. Another experiment gave subjects a fake diary of a student with apparently precognitive dreams. This diary described events from the person's life, as well as some predictive dreams and some non-predictive dreams. When subjects were asked to recall the dreams they had read, they remembered more of the successful predictions than unsuccessful ones.
Lucid dreaming is the conscious perception of one's state while dreaming. In this state the dreamer may often (but not always) have some degree of control over their own actions within the dream or even the characters and the environment of the dream. Dream control has been reported to improve with practiced deliberate lucid dreaming, but the ability to control aspects of the dream is not necessary for a dream to qualify as "lucid" — a lucid dream is any dream during which the dreamer knows they are dreaming. The occurrence of lucid dreaming has been scientifically verified.
Oneironaut is a term sometimes used for those who lucidly dream.
Communication through lucid dreaming
In 1975, parapsychologist Keith Hearne successfully communicated to a patient experiencing a lucid dream. On April 12, 1975, after being instructed to move the eyes left and right upon becoming lucid, the subject had a lucid dream and the first recorded signals from a lucid dream were recorded.
Years later, psychophysiologist Stephen LaBerge conducted similar work including:
- Using eye signals to map the subjective sense of time in dreams
- Comparing the electrical activity of the brain while singing awake and while dreaming.
- Studies comparing in-dream sex, arousal, and orgasm
Dreams of absent-minded transgression
Dreams of absent-minded transgression (DAMT) are dreams wherein the dreamer absentmindedly performs an action that he or she has been trying to stop (one classic example is of a quitting smoker having dreams of lighting a cigarette). Subjects who have had DAMT have reported waking with intense feelings of guilt. One study found a positive association between having these dreams and successfully stopping the behavior.
The recall of dreams is extremely unreliable, though it is a skill that can be trained. Dreams can usually be recalled if a person is awakened while dreaming. Women tend to have more frequent dream recall than men. Dreams that are difficult to recall may be characterized by relatively little affect, and factors such as salience, arousal, and interference play a role in dream recall. Often, a dream may be recalled upon viewing or hearing a random trigger or stimulus. The salience hypothesis proposes that dream content that is salient, that is, novel, intense, or unusual, is more easily remembered. There is considerable evidence that vivid, intense, or unusual dream content is more frequently recalled. A dream journal can be used to assist dream recall, for personal interest or psychotherapy purposes.
For some people, sensations from the previous night's dreams are sometimes spontaneously experienced in falling asleep. However they are usually too slight and fleeting to allow dream recall. At least 95% of all dreams are not remembered. Certain brain chemicals necessary for converting short-term memories into long-term ones are suppressed during REM sleep. Unless a dream is particularly vivid and if one wakes during or immediately after it, the content of the dream is not remembered.
In line with the salience hypothesis, there is considerable evidence that people who have more vivid, intense or unusual dreams show better recall. There is evidence that continuity of consciousness is related to recall. Specifically, people who have vivid and unusual experiences during the day tend to have more memorable dream content and hence better dream recall. People who score high on measures of personality traits associated with creativity, imagination, and fantasy, such as openness to experience, daydreaming, fantasy proneness, absorption, and hypnotic susceptibility, tend to show more frequent dream recall. There is also evidence for continuity between the bizarre aspects of dreaming and waking experience. That is, people who report more bizarre experiences during the day, such as people high in schizotypy (psychosis proneness) have more frequent dream recall and also report more frequent nightmares.
One theory of déjà vu attributes the feeling of having previously seen or experienced something to having dreamt about a similar situation or place, and forgetting about it until one seems to be mysteriously reminded of the situation or the place while awake.
A daydream is a visionary fantasy, especially one of happy, pleasant thoughts, hopes or ambitions, imagined as coming to pass, and experienced while awake. There are many different types of daydreams, and there is no consistent definition amongst psychologists. The general public also uses the term for a broad variety of experiences. Research by Harvard psychologist Deirdre Barrett has found that people who experience vivid dream-like mental images reserve the word for these, whereas many other people refer to milder imagery, realistic future planning, review of past memories or just "spacing out"—i.e. one's mind going relatively blank—when they talk about "daydreaming."
While daydreaming has long been derided as a lazy, non-productive pastime, it is now commonly acknowledged that daydreaming can be constructive in some contexts. There are numerous examples of people in creative or artistic careers, such as composers, novelists and filmmakers, developing new ideas through daydreaming. Similarly, research scientists, mathematicians and physicists have developed new ideas by daydreaming about their subject areas.
A hallucination, in the broadest sense of the word, is a perception in the absence of a stimulus. In a stricter sense, hallucinations are perceptions in a conscious and awake state, in the absence of external stimuli, and have qualities of real perception, in that they are vivid, substantial, and located in external objective space. The latter definition distinguishes hallucinations from the related phenomena of dreaming, which does not involve wakefulness.
A nightmare is an unpleasant dream that can cause a strong negative emotional response from the mind, typically fear and/or horror, but also despair, anxiety and great sadness. The dream may contain situations of danger, discomfort, psychological or physical terror. Sufferers usually awaken in a state of distress and may be unable to return to sleep for a prolonged period of time.
A night terror, also known as a sleep terror or pavor nocturnus, is a parasomnia disorder that predominantly affects children, causing feelings of terror or dread. Night terrors should not be confused with nightmares, which are bad dreams that cause the feeling of horror or fear.
- Cognitive neuroscience of dreams
- Dream art
- Dream dictionary
- Dream pop
- Dream sequence
- Dream speech
- Dream Yoga
- False awakening
- Lilith, a Sumerian dream demon
- List of dream diaries
- List of dreams
- Mare (folklore)
- Morpheus (mythology)
- Sleep paralysis
- Spirit spouse
- Veridical dream
- "Dream". The American Heritage Dictionary of the English Language, Fourth Edition. 2000. Retrieved 2009-05-07.
- Kavanau, J.L. (2000). "Sleep, memory maintenance, and mental disorders". 12(2). Journal of Neuropsychiatry and Clinical Neurosciences.
- Hobson, J.A. (2009) REM sleep and dreaming: towards a theory of protoconsciousness, Nature Reviews, 10(11)
- Empson, J. (2002). Sleep and dreaming (3rd ed.)., New York: Palgrave/St. Martin's Press
- Ann, Lee (2005-01-27). "HowStuffWorks "Dreams: Stages of Sleep"". Science.howstuffworks.com. Retrieved 2012-08-11.
- Domhoff, W. (2002). The scientific study of dreams. APA Press
- C.S. Lewis. The Discarded Image. Canto, Cambridge University Press. ISBN 978-0-521-47735-2.
- Freud, S. (1900). The interpretation of dreams. London: Hogarth Press
- Uluru - Kata Tjuta National Park: Tjukurpa - Anangu culture environment.gov.au, 2006-06-23
- Seligman, K. (1948), Magic, Supernaturalism and Religion. New York: Random House
- Caillois,R. (1966). Logical and Philosophical Problems of the Dream. In G.E. Von Grunebaum & R. Caillos (Eds.), The Dream and Human Societies(pp. 23-52). London, England: Cambridge University Press.
- . Oppenheim, L.A. (1966). Mantic Dreams in the Ancient Near East in G. E. Von Grunebaum & R. Caillois (Eds.), The Dream and Human Societies (pp. 341-350). London, England: Cambridge University Press.
- Lincoln, J.S. (1935). The dream in primitive cultures London: Cressett.
- 1991. languages of dreaming : Anthropological approaches to the study of dreaming In other cultures. In Gackenbach J, Sheikh A, eds, Dream images: A call to mental arms. Amityville, N.Y.: Baywood.
- Bulkeley, Kelly (2008). Dreaming in the world's religions: A comparative history. pp. 71–73. ISBN 978-0-8147-9956-7.
- O'Neil, C.W. (1976). Dreams, culture and the individual. San Francisco: Chandler & Sharp.
- Cicero, De Republica, VI, 10
- ''A letter that has not been read: Dreams in the Hebrew Bible,'' Shaul Bar. Books.google.co.il. Retrieved 2013-04-04.
- Edgar, Iain (2011). The Dream in Islam: From Qur'anic Tradition to Jihadist Inspiration. Oxford: Berghahn Books. p. 178. ISBN 978-0-85745-235-1.
- Edgar, Iain R.; Henig, David (September 2010). "Istikhara: The Guidance and practice of Islamic dream incubation through ethnographic comparison". History and Anthropology 21 (3): 251–262. doi:10.1080/02757206.2010.496781. Retrieved 9 March 2012.
- Kher, Chitrarekha V. (1992). Buddhism As Presented by the Brahmanical Systems. Sri Satguru Publications. ISBN 81-7030-293-5.
- Tedlock, B. (1981). Quiche Maya dream Interpretation. Ethos, 9(4), 313-350
- Webb, Craig (1995). "Dreams: Practical Meaning & Applications". The DREAMS Foundation.
- "Native American Dream Beliefs". Dream Encyclopedia. Retrieved 10 April 2012.
- "The book of the duchess". Washington State University. Retrieved 2012-05-24.
- "William Langland's The Vision Concerning Piers Plowman". The History Guide. Retrieved 2012-05-24.
- Phillips Lovecraft, Howard (1995). The Dream Cycle of H.P. Lovecraft: Dreams of Terror and Death. Ballantine Books. ISBN 0-345-38421-0.
- "The Neverending Story - Book - Pictures - Video -Icons". Neverendingstory.com. Retrieved 2012-05-24.
- Van Riper, A. Bowdoin (2002). Science in popular culture: a reference guide. Westport: Greenwood Press. p. 56. ISBN 0-313-31822-0.
- Van Riper, op. cit., p. 57.
- Freud, S. (1949)., p. 44
- Freud, S. New Introductory Lectures on Psychoanalysis (pp. 38–70)
- Jung, 1964, p. 21
- Jung, 1969
- Wegner, D.M., Wenzlaff, R.M. & Kozak M. (2004). The Return of Suppressed Thoughts in Dreams. Psychological Science, 15(4), pp.232–236
- Dement, W., & Kleitman, N. (1957). The Relation of Eye Movements during Sleep to Dream Activity. Journal of Experimental Psychology, 53(5), pp. 89-97
- How Dream Works. 2006. Retrieved 2006-05-04.
- "Brain Basics: Understanding Sleep". National Institute of Neurological Disorders and Stroke. 2006. Retrieved 2007-12-16.
- Hobson, J.A. (2009). REM sleep and dreaming: towards a theory of protoconsciousness. Nature Reviews, 10(11), pp. 803–813
- Aston-Jones G., Gonzalez M., & Doran S. (2007). "Role of the locus coeruleus-norepinephrine system in arousal and circadian regulation of the sleep-wake cycle." In G.A. Ordway, M.A. Schwartz, & A. Frazer Brain Norepinephrine: Neurobiology and Therapeutics. Cambridge UP.
- Siegel J.M. (2005). "REM Sleep." Ch. 10 in Principles and Practice of Sleep Medicine. 4th ed. M.H. Kryger, T. Roth, & W.C. Dement, eds. Elsevier. 120–135. Accessed 21 July 2010. Psychology.uiowa.edu
- Trimble, M. R. (1989). The Prefrontal Cortex: Anatomy, Physiology and Neuropsychology of the Frontal Lobe. British Journal Of Psychiatry
- Barbara Bolz. "How Time Passes in Dreams" in A Moment of Science. Indiana Public Media. September 2, 2009. Accessed August 8, 2010.
- Takeuchi, Tomoka (June 2005). "Dream mechanisms: Is REM sleep indispensable for dreaming?". Sleep & Biological Rhythms 3 (2): 56–63. doi:10.1111/j.1479-8425.2005.00165.x.
- Lesku, J. A., Meyer, L. C. R., Fuller, A., Maloney, S. K., Dell’Omo, G., Vyssotski, A. L., & Rattenborg, N.C. (2011). Ostriches sleep like platypuses. PLos ONE, 6(8), 1-7
- Williams, Daniel (April 5, 2007). "While you where sleeping". Time Magazine. Retrieved October 9, 2011.
- "Dream". Encyclopedia Britannica. Retrieved October 26, 2011.
- "Sleep". Encyclopedia Britannica. Retrieved October 26, 2011.
- Williams, Daniel (April 5, 2007). "While you where sleeping". Time magazine. Retrieved October 26, 2011.
- Tsoukalas, I. (2012). The origin of REM sleep: A hypothesis. Dreaming, 22(4), 253-283.
- Vitelli, R. (2013). Exploring the Mystery of REM Sleep. Psychology Today, On-line blog, March 25
- Solms, M. (2000). Dreaming and REM sleep are controlled by different brain mechanisms (23(6) ed.). Behavioral and Brain Sciences. pp. 793–1121.
- Zhang, Jie (2004). Memory process and the function of sleep (6-6 ed.). Journal of Theoretics. Retrieved 2006-03-13.
- Zhang, Jie (2005). Continual-activation theory of dreaming, Dynamical Psychology. Retrieved 2006-03-13.
- Tarnow, Eugen (2003). How Dreams And Memory May Be Related (5(2) ed.). NEURO-PSYCHOANALYSIS.
- "The Health Benefits of Dreams". Webmd.com. 2009-02-25. Retrieved 2012-08-11.
- R. Stickgold, J.A. Hobson, R. Fosse, M. Fosse1 (November 2001). "Sleep, Learning, and Dreams: Off-line Memory Reprocessing". Science 294 (5544): 1052–1057. doi:10.1126/science.1063530. PMID 11691983.
- Jessica D. Payne and Lynn Nadel1 (2004). "Sleep, dreams, and memory consolidation: The role of the stress hormone cortisol". Learning & Memory 11 (6): 671–678. doi:10.1101/lm.77104. ISSN 1072-0502. PMC 534. PMID 15576884.
- Robert, W. Der Traum als Naturnothwendigkeit erklärt. Zweite Auflage, Hamburg: Seippel, 1886.
- Evans, C.; Newman, E. (1964). "Dreaming: An analogy from computers". New Scientist 419: 577–579.
- Crick, F.; Mitchison, G. (1983). "The function of dream sleep". Nature 304 (5922): 111–114. doi:10.1038/304111a0. PMID 6866101.
- Coutts, R (2008). "Dreams as modifiers and tests of mental schemas: an emotional selection hypothesis". Psychological Reports 102 (2): 561–574. doi:10.2466/pr0.102.2.561-574. PMID 18567225.
- Revonsuo, A. (2000). "The reinterpretation of dreams: an evolutionary hypothesis of the function of dreaming". Behavioral Brain Science 23 (6): 877. doi:10.1017/S0140525X00004015.
- Blackmore, Susan (2004). Consciousness an introduction. New York, NY: Oxford University Press. p. 342. ISBN 978-0-19-515343-9.
- Blackmore, Susan (2004). Consciousness an introduction. New York, NY: Oxford University Press. pp. 342–343. ISBN 978-0-19-515343-9.
- Tubo, J. "The evolution of dreaming".
- Franklin, M; Zyphur, M (2005). "The role of dreams in the evolution of the human mind". Evolutionary Psychology 3: 59–78.
- Barrett, Deirdre. An Evolutionary Theory of Dreams and Problem-Solving in Barrett, D.L. & McNamara, P. (Eds.) The New Science of Dreaming, Volume III: Cultural and Theoretical Perspectives on Dreaming NY, NY: Praeger/Greenwood, 2007. Books.google.com. Retrieved 2013-04-04.
- Barrett, Deirdre. The Committee of Sleep: How Artists, Scientists, and Athletes Use their Dreams for Creative Problem Solving—and How You Can Too. NY: Crown Books/Random House, 2001[dead link]
- "Barrett, Deirdre. The 'Committee of Sleep': A Study of Dream Incubation for Problem Solving. Dreaming: Journal of the Association for the Study of Dreams, 1993, 3, pp. 115–123". Asdreams.org. Retrieved 2013-04-04.
- Blechner, M. (2001) The Dream Frontier. Hillsdale, NJ: The Analytic Press.
- Blackmore, Susan (2004). Consciousness an Introduction. New York, NY: Oxford University Press. pp. 342–343. ISBN 978-0-19-515343-9.
- Y.D. Tsai (1995). "A Mind-Body Interaction Theory of Dream".
- Cartwright, Rosalind D (1993). "Functions of Dreams". Encyclopedia of Sleep and Dreaming.
- Vedfelt, Ole (1999). The Dimensions of Dreams. Fromm. ISBN 0-88064-230-0.
- Ferenczi, S. (1913) To whom does one relate one's dreams? In: Further Contributions to the Theory and Technique of Psycho-Analysis. New York: Brunner/Mazel, 349.
- Kramer, M. (1993) The selective mood regulatory function of dreaming: An update and revision. In: The Function of Dreaming. Ed., A. Moffitt, M. Kramer, & R. Hoffmann. Albany, NY: State University of New York Press.
- Hartmann, E. (1995). "Making connections in a safe place: Is dreaming psychotherapy?". Dreaming 5 (4): 213–228. doi:10.1037/h0094437.
- LaBerge, S. & DeGracia, D.J. (2000). Varieties of lucid dreaming experience. In R.G. Kunzendorf & B. Wallace (Eds.), Individual Differences in Conscious Experience (pp. 269-307). Amsterdam: John Benjamins.
- Hall, C., & Van de Castle, R. (1966). The Content Analysis of Dreams. New York: Appleton-Century-Crofts. Content Analysis Explained
- "How do blind people dream? - The Body Odd". March 2012. Retrieved 10 May 2013.
- Zadra, A., "1093: Sex dreams: what to men and women dream about?", Sleep Volume 30, Abstract Supplement, 2007 A376.
- "Badan Pusat Statistik "Indonesia Young Adult Reproductive Health Survey 2002–2004" p. 27" (PDF). Retrieved 2013-04-04.
- Michael Schredl, Petra Ciric, Simon Götz, Lutz Wittmann (November 2004). "Typical Dreams: Stability and Gender Differences". The Journal of Psychology 138 (6): 485–94. doi:10.3200/JRLP.138.6.485-494. PMID 15612605.
- Richard Alleyne (October 17, 2008). "Black and white TV generation have monochrome dreams". Daily Telegraph (London).
- Harrison, John E. (2001). Synaesthesia: The Strangest Thing. Oxford University Press. ISBN 0-19-263245-0.
- Cloud, John (February 25, 2009). "Why dreams mean less than we think". Time magazine. Retrieved October 26, 2011.
- "The Science Behind Dreams and Nightmares". Npr.org. Retrieved 2013-04-04.
- Antrobus, John (1993). "Characteristics of Dreams". Encyclopedia of Sleep and Dreaming.
- Geneviève Alain, MPs; Tore A. Nielsen, PhD, Russell Powell, PhD, Don Kuiken, PhD (July 2003). "Replication of the Day-residue and Dream-lag Effect". 20th Annual International Conference of the Association for the Study of Dreams.
- Hines, Terence (2003). Pseudoscience and the Paranormal. Prometheus Books. pp. 78–81. ISBN 978-1-57392-979-0.
- Gilovich, Thomas (1991). How We Know What Isn't So: the fallibility of human reason in everyday life. Simon & Schuster. pp. 177–180. ISBN 978-0-02-911706-4.
- Alcock, James E. (1981). Parapsychology: Science or Magic?: a psychological perspective. Oxford: Pergamon Press. ISBN 0-08-025773-9. via Hines, Terence (2003). Pseudoscience and the Paranormal. Prometheus Books. pp. 78–81. ISBN 978-1-57392-979-0.
- Madey, Scott; Thomas Gilovich (1993). "Effects of Temporal Focus on the Recall of Expectancy-Consistent and Expectancy-Inconsistent Information". Journal of Personality and Social Psychology 62 (3). via Kida, Thomas (2006). Don't Believe Everything You Think: The 6 Basic Mistakes We Make in Thinking. Prometheus Books. ISBN 978-1-59102-408-8.
- Lucid dreaming FAQ by The Lucidity Institute at Psych Web.
- Watanabe, T. (2003). "Lucid Dreaming: Its Experimental Proof and Psychological Conditions". J Int Soc Life Inf Sci 21 (1). ISSN 1341-9226.
- , Lucid Dream Communication
- LaBerge, S. (2014). Lucid dreaming: Paradoxes of dreaming consciousness. In E. Cardeña, S. Lynn, S. Krippner (Eds.) , Varieties of anomalous experience: Examining the scientific evidence (2nd ed.) (pp. 145-173). Washington, DC US: American Psychological Association. doi:10.1037/14258-006
- Hajek P, Belcher M (1991). "Dream of absent-minded transgression: an empirical study of a cognitive withdrawal symptom". J Abnorm Psychol 100 (4): 487–91. doi:10.1037/0021-843X.100.4.487. PMID 1757662.
- Watson, David (2003). "To dream, perchance to remember: Individual differences in dream recall". Personality and Individual Differences 34 (7): 1271. doi:10.1016/S0191-8869(02)00114-9.
- Hobson, J.A.; McCarly, R.W. (1977). "The brain as a dream-state generator: An activation-synthesis hypothesis of the dream process". American Journal of Psychiatry 134 (12): 1335–1348. PMID 21570.
- Lohff, David C. (2004). The Dream Directory: The Comprehensive Guide to Analysis and Interpretation. Running Press. ISBN 0-7624-1962-8.
- Klinger, Eric (October 1987). Psychology Today.
- Barrett, D. L. The Hypnotic Dream: Its Content in Comparison to Nocturnal Dreams and Waking Fantasy. Journal of Abnormal Psychology, 1979, Vol. 88, p. 584 591; Barrett, D. L. Fantasizers and Dissociaters: Two types of High Hypnotizables, Two Imagery Styles. in R. Kusendorf, N. Spanos, & B. Wallace (Eds.) Hypnosis and Imagination, NY: Baywood, 1996; & Barrett, D. L. Dissociaters, Fantasizers, and their Relation to Hypnotizability in Barrett, D. L. (Ed.) Hypnosis and Hypnotherapy, (2 vol.): Vol. 1: History, theory and general research, Vol. 2: Psychotherapy research and applications, NY, NY: Praeger/Greenwood, 2010.
- Tierney, John (June 28, 2010). "Discovering the Virtues of a Wandering Mind". The New York Times.
- American Psychiatric Association (2000), Diagnostic and Statistical Manual of Mental Disorders, 4th ed, TR, p. 631
- Freud, Sigmund (1994). The interpretation of dreams. New York: Modern Library. ISBN 0-679-60121-X.
- Jung, Carl (1934). The Practice of Psychotherapy. "The Practical Use of Dream-analysis". New York: Routledge & Kegan Paul. pp. 139–. ISBN 0-7100-1645-X.
- Jung, Carl (2002). Dreams (Routledge Classics). New York: Routledge. ISBN 0-415-26740-4.
- Harris, William V., Dreams and Еxperience in Classical Antiquity (Cambridge, Mass.; London: Harvard University Press, 2009).
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- Dreams on In Our Time at the BBC. (listen now)
- LSDBase - an online sleep research database documenting the physiological effects of dreams through biofeedback.
- Archive for Research in Archetypal Symbolism website
- The International Association for the Study of Dreams
- Dream at DMOZ
- Dixit, Jay (2007). "Dreams: Night School". Psychology Today.