There have been a few in this thread for whom melatonin helped with sleep. We each seem to have different constitutions, and what works for one, may not for another. Neither melatonin nor niacin are prescription drugs, so those of us who wish to try it can simply go to grocery stores that have a pharmacy section that carries common vitamins and supplements or a local pharmacy, or most any other store that carries common vitamins and supplements, and pick these up at quite reasonable prices.
There have been a number of suggestions made in this thread to try. Some, all, or none, might work for you. I am simply reporting that one suggestion made here is working for me.
Tony