The best OTC sleep aid I have tried is Sleep MD. I forget the blend, but I take it about an hour before, and I usually find myself yawning and very tired pretty quickly. I get good solid sleep with no hangover drowsy feeling the next day..
I have also tried Alteril, which I can say didn't do anything for me. I find that Tryptophan heavy pills are more hype than anything IMO..
You could also try using hops if you can get them. Yes hops, the same hops that are in beer. Many sleep aids have small amounts of humulus lupulus, which is the family hops belong to. I drink hop tea to relax sometimes, and also the savor and fully get into the hops I'm trying...I'm a beer brewing geek, so I always have hops on hand...
Mt Snow, VT - May 5, 2012 - Completed!
Gunstock, NH - June 1, 2013 - Completed!
...i remain, he who remains to be...