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Narcolepsy is a neurological condition in which a person has a hard time staying awake during the day. A person with narcolepsy may suddenly fall asleep during an activity. It is a neurological condition in which people experience excessive daytime sleepiness, cataplexy, sleep paralysis, hallucinations, and intermittent, uncontrollable sleep attacks during the day. Treatment involves taking medicine to help a narcoleptic stay awake during the daytime.A neurological condition in which people experience excessive daytime sleepiness, cataplexy, sleep paralysis, hallucinations, and intermittent, uncontrollable sleep attacks during the day.