I'm the same way. Lately I've been having the same problem. I don't know the cause, but sometimes I get so tired that I sleep during the day. I find that I sleep to late in the evening, that it affects me sleeping at night. So I bare with it, nearly die, but I sleep really well. (although I'm tired anywya....)

However, I don't know what to do in your case. Stupid idea, but when I was really stressed, I had these CDs that would relax you. It was a person talking about different calming things. I find it relaxed me and helped me sleep.....