insomnia
"I have taken half a tablet of doxylamine succinate (Sleep Aid), in the evening, for about 3 years now. I originally took it for migraines, but discovered quickly, how it made me very drowsy after about 2 hours.
It has NEVER failed to work. Taking a whole tablet made me sleep for 10-12 hours, now I get my 8 hours every night with half the dose. It is one of the safest antihistamines on the market.
I experimented a few months ago, by not taking one, & I couldn't get to sleep, plus I got restless legs. So now I take it every night."