Be aware that not everyone fits neatly into this definition. It is just a general definition. Kleine-Levin Syndrome is a rare disorder characterized by the need for excessive amounts of sleep. The disorder primarily strikes adolescents.
Many patients report a hypersensitivity to noise.
Some patients show an abnormally uninhibited sexual drive. Symptoms of Kleine-Levin Syndrome are cyclical. An affected individual may go for weeks or months without experiencing any symptoms, with perfect health and no evidence of behavioral or physical dysfunction. When present, KLS symptoms may persist for days to weeks or even months. The exact cause of Kleine-Levin Syndrome is not yet known.