This is my exact sleeping pattern right now. I go to sleep early, depressed wanting the pain to end for a while, so I wake early, depressed not ready for the world so I try to sleep as much as possible. The nightmares I have around waking time are crazy too. The overtiredness is there too. I think it is all related to the depression and meds I am taking right now. For me I think the mixed episode I am in needs to be treated for me to be able to get into a 'normal' sleeping pattern. It is impossible while feeling so bad.