Recurrent Hypersomnia (Kleine Levin Syndrome)

Recurrent Hypersomnia (Kleine Levin Syndrome):
This is a condition associated with excessive somnolence which may last for a few days to several weeks and can occur between one to ten times in a year. Individuals may sleep up to 16 hours a day and typically wake up just to void and eat. The patients tend to have neurocognitive manifestations such as hypersexuality, irritability and aggressiveness. Physical manifestations may include a reddish face with associated severe sweating.

Extremely rare disorder with male predominance, Flu like illnesses have been reported prior to the onset of the first episode in some cases.
Symptoms usually begin to occur in early adolescence and the median range for symptoms is 4 years in this self limiting condition. Differential diagnosis of waxing and waning sleepiness include, tumors in the 3rd ventricle, bipolar disorder, seasonal affective disorder and other disorders of excessive sleepiness including extrinsic disorders like sleep apnea, periodic limb movement in sleep and seizure disorders.