Melatonin: Melatonin is a hormone produced by your brain in cycles affected by sleep. In the States, it is also sold as a dietary supplement w/o any 3rd party oversight regarding quality control over its manufacture & production. Some people take melatonin chronically for years on end while others only take it when flying across several time zones. Check out http://www.drugs.com/melatonin.html for more info.
Answered 12/6/2014
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