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Hypersomnia is excessive amount of sleepiness.
According to the website of the U. S. National Institute of Neurological Disorders and Stroke, which is in the public domain and may be freely copied:
An adult is considered to have hypersomnia if he or she sleeps more than 10 hours per day on a regular basis for at least two weeks, or if he or she is compelled to nap repeatedly during the day.
One diagnosis tool is the Epworth Sleepiness Scale, which helps determine the extent of EDS in a subject. A self test is available from Stanford University Medical School.
Hypersomnia can be caused by genetics (heredity), brain damage, and disorders such as clinical depression, uremia and fibromyalgia. Hypersomnia can also be a symptom of other sleep disorders such as narcolepsy, sleep apnea, and restless leg syndrome.
People who are overweight may be more likely to suffer from hypersomnia. This can often exacerbate weight problems as excessive sleeping decreases metabolic energy consumption, making weight loss more difficult. However, it is also the case that sleep disorders of this nature provoke or initiate weight gain due to a tendency to attempt to manage low energy levels by eating non-complex carbohydrates.
Another possible cause is an infection of mononucleosis, as several instances of hypersomnia have been found to arise immediately after such an infection (Dr. Givan, MD, Riley Hospital).
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