What are hypnagogic hallucinations?

Hypnagogic hallucination is a medical term for sensory experiences that occur when you are transitioning from being awake to falling asleep. This can be anything from feeling, hearing, seeing, smelling or tasting something that is not there. Hypnagogic hallucinations are associated with trouble sleeping, anxiety, depression or alcohol use. They can occur in healthy people. Approximately 1 out of 4 people have hallucinations during sleep. Often, treatment is not needed if they do not affect the quality of your sleep. If you have severe or persistent sleep-related hallucinations, talk to your doctor.
Hypnagogic hallucinations are vivid, often frightening, dream-like experiences that occur while dozing or falling asleep. Like sleep paralysis, they are common in people with narcolepsy. However, they can also occur in those with no identified sleep disorder.

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