Doxylamine
"Does it work?  You bet it does.  I have suffered from insomnia for 18 years so I know when I'm asleep or not.  This med is wonderful in keeping you asleep for 5 1/2 to 6 hours.  This med is also effective in getting you to sleep.  The downside.  My God is it drowsy.  I'm usually a guy who doesn't  complain but this med makes you super drowsy.  In addition to the drowsiness, it will make you irritable because you don't feel good.  In conclusion, I would recommend it because the psychological benefit of knowing you slept slightly outweighs its side effects.  I hope this info helps.  Best of dreams."