Maladaptive daydreaming or excessive daydreaming is a psychological concept first introduced by Eli Somer to describe an extensive fantasy activity that replaces human interaction and/or interferes with academic, interpersonal, or vocational functioning. It might be related to childhood emotional neglect or abuse that motivate victims to divorce from the threatening world and from their material entity. 
- Fantasy prone personality
- Repressed memory
- Attention-Deficit Hyperactivity Disorder
- Obsessive–compulsive disorder
- Major Depressive Disorder
- Borderline Personality Disorder
- Bipolar Disorder
- Somer, Eli. "Maladaptive Daydreaming: A Qualitative Inquiry". Journal of Contemporary Psychotherapy. Journal of Contemporary Psychotherapy. Retrieved 18 May 2014.
- Ardino, Vittoria (ed.). Post-Traumatic Syndromes in Childhood and Adolescence. Chichester, West Sussex, UK: Wiley-Blackwell. p. 162. ISBN 978-0-470-66929-7.