Causes
While some researchers speculate that there may be a hereditary predisposition, others believe the condition may be the result of an autoimmune disorder. Both proposals need not be mutually exclusive with the result being a malfunction of the portion of the brain that helps to regulate functions such as sleep, appetite, and body temperature (hypothalamus). Recent studies also suggest that there may be a link to a deficiency of dopamine transporter density in the lower striatum.
Read more about this topic: Kleine-Levin Syndrome