What is Kleine-Levin Syndrome?
Kleine-Levin syndrome is a rare disorder that causes recurring periods of excessive drowsiness and sleep (up to 20 hours per day). Symptoms, which may last for days to weeks, include excessive food intake, irritability, disorientation, lack of energy, and hypersensitivity to noise. Some patients may also experience hallucinations and an abnormally uninhibited sex drive. Affected persons are normal between episodes, although depression and amnesia may be noted temporarily after an attack. It may be weeks or more before symptoms reappear. Onset is typically around adolescence to the late teens. The disorder is 4 times more common in males than in females. Symptoms may be related to malfunction of the hypothalamus, the part of the brain that governs appetite and sleep.