I had this problem a few months ago, hubby thought I just didn't want to go to bed. I would stay up til 3-4 am then sleep til 6am, did this every night for about a month and I was sooo tired! I'm not on any meds so only thing I changed was my caffine, I stopped ALL caffine around 3pm nothing after that but water or milk. We usually go to bed about 11pm and this started working an hour or so earlier each night. Now I'm back to normal again. Good luck, do some quilting maybe?