It does seem that this is a struggle for many. Here I am again at 5am after trying to get back to sleep for the last 3 1/2 hours. But at 9:30 last night, I could not keep my eyes open and I fell asleep withing minutes of going to bed. And I absolutely do need more than 4 hours a night. I've never heard of Melatonin @Mollygirl - is it a sedative?
@Afraser I find the problem with puzzles (and books) is that I get engrossed. I used to play solitaire on the computer when I couldn't sleep during pregnancy but now, like a good girl, I try to avoid blue light until I give up completely.