Kleine-Levine Syndrome (KLS) a.k.a Sleeping Beauty Syndrome, is a rare disorder characterized by excessive sleep lasting for days, weeks or months at a time. Periods of wakefulness may come with disorientation and hallucination.
It affects mainly adolescents, although it could occur in teenagers and young adults. During episodes, the affected person wakes up only to eat or to use the bathroom. In prolonged episodes, they may be unable to carry out normal day to day activities, or even attend school or work. It is also possible to go for long periods without having symptoms.
Although there are no specific tests to diagnose KLS, excessively long hours of sleep coupled with some associated symptoms such as irritability, confusion and hallucinations, could be suggestive of the condition. Diagnosis of KLS is difficult because the symptoms vary and diseases similar to KLS must be eliminated.