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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.
Poor Sleep Habits. A woman yawns over coffee due to being sleepy from poor sleep habits. Tetra Images - Jamie Grill/Brand X Pictures/Getty Images. The most common cause of always feeling too sleepy or drowsy during the daytime might be the most obvious: you are simply not getting enough sleep at night.