Have you tried taking benedryl, you know, the allergy medication? It works for me, usually-especially should I take it with a drink, usually a beer or two.
Valerian root has been used forever as a sleep aide, you typically only find that stuff in a vitamin shop though. Valerian smells horrible-but it works for me as well.
I typically take two benedryl, but maybe a little more would work better for you if you've got serious sleeping problems. Valerian can be dangerous, I'm told, should you take too much.
I should tell you that the best thing that I've ever taken as far as sleeping aids are concerned is a prescription medication typically given as a mood stabilizer, seraquill. I do not know how to spell it correctly, but you pronounce it "sarah-quill."