You can try anything with Diphenhydramine,
Excedrin PM
Nytol
Tylenol PM

or just about any thing with antihistamines in it. The idea behind OTC sleep aides is to get the brain tired, so you feel drowsy. They work for people with mild sleeping issues, but generally won't work for serious sleep issues.

Usually you will need hypnotics/sedatives, Ambien, some anti-psychotics also work. I'm getting good results so far from Seroquel. Nothing but hypnotics worked for me before seroquel and I tried every thing. Everyone is different though!

Good Luck!