Here is an interesting article on sleep. Some neat stuff in there and some ideas for how to get better sleep.
And then there is this sleep test. I was a 'rocketing rabbit' when I took it.
The discussion topic this week in my Pysch course is on sleep. Since I don't have any sort of set schedule I've been messing around with it to see what works for me. What I found that works best, as immpractical as it would be for most people, is to just sleep when I'm tired and wake up when I wake up. This has me taking naps in the middle of the day and going to sleep late. Lately I've been hitting the hay around 3ish and getting up about 10ish with a nap in the evening. I find I am more energized and happier this way.
What works for you?