Since I work nights, I have to try to sleep around 1-2pm in the afternoon, which can be very difficult. I typically use Tylenol PM, but only half to a quarter dose! They recommend using two pills, but that knocks me out for 12+ hours. I find that if I bite a single pill in half, it's enough to put me to sleep in 30-45 minutes and sleep for 7 hours. If you do take this, it does leave you "foggy" for at least an hour after you wake up. I use this one when I've had a particularly bad stretch of sleep, or on my days off when sleep doesn't matter.
I also take a product called "Snooze-In w/Melatonin" from Vitamin Shoppe. It has:
Passion Flower 50mg
I like using this one the best, mainly because it doesn't leave me "foggy" and after 7-8 hours of sleep I feel pretty good. I don't feel any side effects from this. I use this one at least once-twice a week. As was suggested previously though, lay off the caffeinated drinks prior to sleep. For me, that included not taking my morning coffee at 8am after work. So the last dose of caffeine I have is around 5am from HOT-ROX, and that's it!