I guess I'm being prolific today. I just found this very interesting ebook. I like the fact that it lists lots of different options not just the ones espoused by the National Sleep Foundation (which aren't working for me and my invading army at present so alternatives are welcome). I also like that the author backs up their information with links to source material or things for further study.
40 Sleep Hacks: The Geek's Guide to Optimizing Sleep