Doxepin
"Especially good for helping you stay asleep!  The problem is that I slept 12 hours straight and most of the next day.  I didn't really have an issue staying asleep before- my issue is more with relaxing/ going to sleep at appropriate times.  So, if you have a lot of trouble staying asleep, this definitely works.  No terrible side effects, was just very sleepy.  If you really need the sleep, go for it!"