Side effect possible: Benadryl (diphenhydramine) and melatonin could make a purpose MORE tired and sleepy which could translate into being groggy in the morning thought for all practical purposes, 1 mg. of melatonin is an extremely small amount. Then, again, I don't know anything about your build, your weight, other medications you are taking, etc. etc. so perhaps FOR YOU....1 mg. of melatonin is more than what it may sound.
Answered 6/24/2014
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