Health
Sleep Disorders

Why do you feel tired after sleeping for a long time?

Answer

Wiki User
01/11/2013

The problem is that, when you sleep in excess of 9 hours or so, you wind up getting too much "light" sleep and not enough "deep" sleep. That's why you feel groggy after waking up.

Oversleeping can actually be harmful to you health. See the related link for a great article that goes into more detail.