I have the same problem....when I do get to sleep (lately its between 4-7am!), then I sleep like 10 hours or more. Sometimes 12...in the past I've even slept 15 hours! And I still feel tired....thats why I don't get out of bed in the first place...I feel like my body is sunk into the bed...like part of the bed.

I don't know how to help...maybe someone else will?! It might also have alot to do with depression, if you suffer from that. I know that's the reason I sleep so much.