National Organization for Rare Disorders, Inc.
- Kleine-Levin Hibernation Syndrome
- Familial Hibernation Syndrome
- Periodic Somnolence and Morbid Hunger
Kleine-Levin syndrome is a rare disorder characterized by the need for excessive amounts of sleep (hypersomnolence), (i.e., up to 20 hours a day); excessive food intake (compulsive hyperphagia); and behavioral changes such as an abnormally uninhibited sexual drive. The disorder primarily affects adolescent males. When awake, affected individuals may exhibit irritability, lack of energy (lethargy), and/or lack of emotions (apathy). They may also appear confused (disoriented) and experience hallucinations. Symptoms of Kleine-Levin syndrome are cyclical. An affected individual may go for weeks or months without experiencing symptoms. When present, symptoms may persist for days to weeks. In some cases, the symptoms associated with Kleine-Levin syndrome eventually disappear with advancing age. However, episodes may recur later during life.
The exact cause of Kleine-Levin syndrome is not known. However, researchers believe that in some cases, hereditary factors may cause some individuals to have a genetic predisposition to developing the disorder. It is thought that symptoms of Kleine-Levin syndrome may be related to malfunction of the portion of the brain that helps to regulate functions such as sleep, appetite, and body temperature (hypothalamus). Some researchers speculate that Kleine-Levin syndrome may be an autoimmune disorder.
National Sleep Foundation
1010 N. Glebe Road
Arlington, VA 22201
American Sleep Association
1610 14th Street NW
Rochester, MN 55901
National Mental Health Consumers' Self-Help Clearinghouse
1211 Chestnut Street
Philadelphia, PA 19107-6312
Mental Health America
2000 N. Beauregard Street, 6th Floor
Alexandria, VA 22314-2971
NIH/National Institute of Mental Health
Health Science Writing, Press and Dissemination Branch
6001 Executive Boulevard
Room 8184, MSC 9663
Bethesda, MD 20892-9663
NIH/National Institute of Neurological Disorders and Stroke
P.O. Box 5801
Bethesda, MD 20824
MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay, WI 54301-1243
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Kleine-Levin Syndrome Foundation
PO Box 5382
San Jose, CA 95150-5382
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Last Updated: 4/6/2007
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