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A pathological increase in one’s need for sleep, often accompanied by excessive daytime sleepiness.

Example: A patient struggles to awaken after ten hours of sleep, night after night for months. On weekends, he sleeps for fourteen hours or more.

APA Reference
Grinnell, R. (2016). Hypersomnia. Psych Central. Retrieved on May 24, 2018, from https://psychcentral.com/encyclopedia/hypersomnia/