Hypersomnia - refers to a type of type of dyssomnia that involves being  chronically sleepy and sleeping for long periods at a time. Also means  sleeping too much or being too sleepy during the day. It is a sleeping disorder; an abnormally excessive sleep. A person with this condition  falls asleep several times a day.
Other /More definition:
Hypersomnia refers to excessive daytime sleepiness. This can result from depression, insomnia, narcolepsy, sleep apnea, sleep drunkenness, periodic limb movements, drug abuse, and other problems. Hypersomnia is abnormally excessive sleep. A person with this condition falls asleep several times a day, chronically sleepy and sleeping for long periods at a time. Hypersomnia is also defined as a sleep disturbance in which the affected individual sleeps too much or being too sleepy during the day.
List of books: Hypersomnia
Other /More definition:
hypersomnia refers to abnormally excessive sleep. A person with this condition falls asleep several times a day.

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