Apparently 3 to 6 mg at bedtime is helpful for some people.
http://yourlife.usatoday.com/health/sto ... 51847640/1•Take melatonin. Mention this natural hormone and most people think "sleep aid." But research reported in the April 2011 Journal of Pharmacology shows melatonin reduces stomach acid but doesn't block it, as many GERD medicines do, notes Mark Stengler, a naturopathic medical doctor and author of books on integrative medicine. That matters because "you need stomach acid for normal digestion" and "to prevent bad bacteria," he explains. For his adult GERD patients, Stengler prescribes 3 to 6 milligrams of melatonin daily at bedtime; it is not recommended for children and pregnant women.
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