hypnagogic hallucination (imagery)
Vivid sensory images occurring at sleep onset, but particularly vivid with sleep-onset REM periods. A feature of narcoleptic naps when the onset occurs with REM sleep.*
Also: narcolepsy, hypnopompic, sleep paralysis
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann