insomnia
"Because of a long history of narcotic (painkiller) use, my doctor suggested that my body was not producing melatonin and that my insomnia might be because of this. Sure enough, the very first night I took the medicine, I slept well, with no after effects. That is the best thing about this medicine. I take it half an hour before I'm wanting to go to bed, I get a bit drowsy and go to bed, falling asleep quickly, but awaking fully rested."