Your posts sounds like me recently: I'd sleep 10 hours a night and still take a 2 hour nap during the afternoon. I agree: have your thyroid checked but also you could have sleep apnea- the apnea will wake you up without you knowing it several times a night and thus the sleepy feeling during the day. Not unheard of if the bipolar meds have had you put on some weight. (Like so many of us!)