Doxepin
"I was given Doxepin 50mg to help me sleep.  It knocked me out -  This is the zombie apocalypse of sleep meds.   It worked very well, but kept working all the next day.  I slept about 17 hours and felt extremely groggy when I got up.  I wouldn't recommend it if you just have trouble falling to sleep.  I need something milder so i can function the next day."