I figured out some years ago that I need around 9 hours sleep a night to feel OK, having had a baby since then I can survive on 4 Hours albeit only surviving!
If I was to go to sleep at 10.30 and rise at 7.30 I feel less alert than if I was to sleep at 1am and rise at 10.
I know some people are morning people and some aren't but is there anyway to become more of a morning person. It baflles me that I can still feel hazy for over an hour after waking when it's earlier but more alert of I wake later!