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The average sleeping time for an adult is eight hours. There are several causes as to why a person sleeps too much -- a condition medically termed as hypersomnia or oversleeping. However, some common causes are stress, lack of self-discipline, and poor sleep in a span of a couple of days.
Sleep Apnea and Excessive Sleepiness. Sleep apnea is becoming a more common cause of sleepiness in children and adults. Sleep apnea occurs when the upper airway collapses for at least 10 seconds during sleep -- and does so up to hundreds of times each night. Obstructive sleep apnea is the result of a blockage in the airway.