Hypersomnia Foundation

Kleine-Levin syndrome

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Kleine-Levin syndrome (KLS) is a rare disorder in which affected people experience episodes at least once per year during which they sleep for at least 11 hours out of every day (but often for days at a time), eat excessively (megaphagia), have abnormal thinking and behavior, and hypersexuality. Between episodes, their alertness, behavior, and thinking are normal

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