Sleep MD is an over the counter sleep aid which contains the commonly used melatonin. Melatonin is a hormone that occurs naturally in people. It's level in your body peaks at night-time. It is triggered by darkness and levels remain elevated throughout the night until light eventually decreases it. It is for this reason, melatonin has been studied for use as a sleep aid. The problem is, most studies have shown that it is no more effective than a placebo. Some positive results have been shown in treating jet lag. It’s unclear whether simple light exposure is more effective than melatonin. Long term effects are not known.

Sleep MD retails for about $25.

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