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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
http://www.medicinenet.com/script/main/art.asp?articlekey=10482
Last Editorial Review: 6/14/2012

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