I tried Melatonin several years ago because of sleep deprivation. It worked for a about a month before I had to stop taking it. At first, I thought I had found a Wonder Drug. Not only was I sleeping, my chronic pain was almost gone. Then I started having nightmares. I had to stop taking it because the dreams were getting to be too horrible and I didn't wake up like I usually do when my dreams go wrong.
I am not trying to scare you. I just want to make you aware that it is not for everyone. If you do choose to try it, I sincerely hope it works well for you. :)