Kleine-Levin Syndrome, or KLS, is a rare neurological disorder characterized by recurring periods of excessive amounts of sleep and altered behavior. At the onset of an episode the patient becomes drowsy and sleeps for most of the day and night (hypersomnolence), waking only to eat or go to the bathroom. When awake, the patient’s whole demeanor is changed, often appearing “spacey” or childlike. When awake he experiences confusion, disorientation, complete lack of energy (lethargy), and lack of emotions (apathy). Individuals are not able to attend school, work or care for themselves. Most are bedridden, tired and uncommunicative even when awake.
Most patients report that everything seems out of focus, and that they are hypersensitive to noise and light. In some cases, food cravings (compulsive hyperphagia) are exhibited. Instances of uninhibited hypersexuality during episodes (mostly males) and instances of depression (mostly females) have also been reported.
Affected individuals may go for a period of weeks, months or even years without experiencing any symptoms, and then they reappear with little warning. In between episodes those diagnosed with KLS appear to be in perfect health with no evidence of behavioral or physical dysfunction.
The cause of Kleine-Levin Syndrome is not known. Thus, family support and education are the best management currently available.
References
Wikipedia:Kleine-Levin syndrome