What is Hypersomnolence, idiopathic?
• Hypersomnolence, idiopathic: Extreme sleepiness that occurs for no apparent reason. The sleepiness persists even after having a sleep and can severely affect a person’s ability to function. Sufferers tend to sleep at night and still require sleep during the day. Hypersomnolence, idiopathic is listed as a “rare disease” by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Hypersomnolence, idiopathic, or a subtype of Hypersomnolence, idiopathic, affects less than 200,000 people in the US population.
