Medical Terminology

hypnagogic hallucinations

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Hypnagogic or hypnopompic hallucinations are sensory experiences involving the apparent perception of something that is not present, that occur at the transition from wakefulness to sleep (hypnagogic) or from sleep to wakefulness (hypnopompic). These hallucinations are typically visual in nature, but can affect other forms of sensation, such as hearing or touch.