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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 maintenance insomnia can also be caused by or exacerbated by other factors such as; Excess Caffeine. Too much caffeine, especially in the afternoons or evenings, can cause sleep maintenance insomnia by producing fewer periods of slow wave or deep sleep.