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Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness and sudden, uncontrollable sleep attacks. It is caused by a deficiency in the neurotransmitter hypocretin, which regulates wakefulness and sleep. Symptoms of narcolepsy can include cataplexy, sleep paralysis, and hypnagogic hallucinations. Treatment options may include medication, lifestyle changes, and behavioral therapy.

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