melatonin and/OR Benedryl (Tylenol PM and the like)...look for 1MG or so melatonin...maybe even ½mg to start. Take it on a schedule and early, if possible, rather than late at night when you're desperate. The ingredient in Benedryl has the virtue that it doesn't require stronger doses after awhile.

I do have a prescription for Temezepam (Restoril) which will put me to sleep for a few hours, but is not intended for everyday use for long periods, as you can get to where it loses its efficaciousness...(means you get saturated with it, or something)