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Excessive Daytime Sleepiness


Updated February 19, 2014

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Definition: It is the subjective report of an increased desire to fall asleep and lack of energy during the day even after an adequate night’s sleep. It may indicate the presence of a medical disorder.
Excessive daytime sleepiness, including the desire to nap, can be due to sleep deprivation or an underlying medical condition.

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