Hypnophobia, also termed clinophobia or somniphobia, is the often irrational and excessive fear of sleep. It may result from a feeling of control loss, or from repeating nightmares or anxiety over the loss of time that could be spent accomplishing tasks or maximizing leisure time instead of sleeping. The prefix hypno- originates from the Greek word ύπνος hypnos, which means sleep. Somniphobia can be caused by the fear of nightmares or sleep paralysis.
- Dunglison, Robert; Dunglison, Richard James (1895). Richard James Dunglison, ed. A dictionary of medical science: containing a full explanation of the various subjects and terms of anatomy, physiology, ... (21 ed.). Lea Brothers & Co.
- "Hypno- dictionary definition - hypno- defined". Retrieved 10 February 2017.
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