Definition of Hypnagogic hallucination
Hypnagogic hallucination: A vivid dreamlike hallucination that occurs as one is falling asleep. The opposite of an hypnopompic hallucination which is a vivid dreamlike hallucination that occurs as one is waking up.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012
Medical Dictionary Definitions A - Z
Search Medical Dictionary
Get tips for better sleep.