There are several herbal things that can help. Valerian is awesome. It smells like dirty sweatsocks, but man does it work!  Also try melatonin--but be careful with this one. It can give a hangover the next day. Take a low dose, and take it early in the evening. They also say taking calcium at bedtime can help sleep.
I use the melatonin rarely, but take the valerian almost every night. Also, chamomile, hops, and a couple other herbs I can't think of now. Or try Celestial Seasonings SleepyTime tea--it has a lot of these herbs in it and is very soothing.