hypnagogic hallucination
Pronunciation: hip-nuh-GOJ-ik
Vivid, often frightening sensory experiences occurring at the transition from wakefulness to sleep.
Full Definition
Hypnagogic hallucinations are vivid perceptual experiences that occur during the hypnagogic state - the transitional period between wakefulness and sleep onset. These hallucinations can be visual, auditory, tactile, or multimodal and are often accompanied by sleep paralysis or a sense of presence in the room. While they can occur in healthy individuals, hypnagogic hallucinations are particularly common in narcolepsy and other sleep disorders. The experiences can be extremely realistic and frightening, sometimes leading to misdiagnosis as psychiatric disorders if the sleep context is not recognized.
Usage
Usage note: Contrast with hypnopompic hallucinations (occurring during awakening). Often associated with sleep disorders rather than psychiatric conditions.
In Context
- "The patient described hypnagogic hallucinations of shadowy figures in her bedroom that disappeared upon full awakening." — Sleep disorder consultation
- "Hypnagogic hallucinations were documented as part of the patient's narcolepsy symptom complex." — Polysomnography report