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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.
Some sleep disorders, such as insomnia, make it so you can't sleep, while many others result in poor sleep quality. Discover 7 common reasons for feeling or being too sleepy during the daytime, including the most common sleep disorder causes affecting sleep quality such as sleep apnea and narcolepsy. A woman yawns over coffee due to being sleepy from poor sleep habits. Tetra Images - Jamie Grill/Brand X Pictures/Getty Images.