I have the same problem. I think for me it's a combination of not wanting to go to work the next day, trying to get ready for the week and sleeping a little late on Saturdays and Sundays. I've been trying to get up earlier but even that doesn't help. This past Sunday I was up at 7, which is about 1/2 hour later than normal and I still didn't get to sleep until 2 or 3 a.m. I have tried the PM drugs but I still have a problem. It's almost like I'm wired when I take them, even if I take them at 7:00 p.m. I still can't sleep. I've resigned myself to the fact that I'm not going to sleep on Sundays.
What happens to me is I think I doze during the night and I feel like I never slept but I know I did. Crazy, I hate it!!!