Heidi,
My DS HATED sleeping on his back. I spoke to his Dr about it, and it seemed for us, it was just a stage. Try his left side, sometimes it's gas, and sometimes it's reflux. Lay him on his side and roll a towel up and put it behind him so he dosen't roll back. My ds started getting up at 3:30 and not wanting to go back to sleep eaither. I finally woke my husband up at 4:30 and made him get up, as I thaught ds was just sick of me. DH said he didn't get back to sleep until around 6:15. He has to work, I'm still on maternity leave. I do go back to work in 1 1/2 weeks, so this has got to stop. Maybe I am letting him sleep to long during the day? Yesterday I was out all day, and didn't long anything, but I know he was sleeping for almost 4 hours at a time (like he does at night) maybe he's switched around again...oh well, we'll start fresh today
Good luck
Jess