It's hard to tell just from that stat page. The media server and screen on are pretty high for the phone being "asleep" all night. Do you stream music? I know Slacker has given me problems in the past and will keep the media server active.
You would be well served to get a batter monitoring app installed to troubleshoot issues like this. Better Battery Stats mentioned above, or GSam Battery Monitor give you a lot more information than the stock monitor on what is using the battery.