By eHow Health Editor
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Melatonin is a natural substance found in the body that regulates its sleep cycles. Melatonin is now available in an over-the-counter supplement. Many people take melatonin supplements to help reset their body clocks and to compensate for the decrease in melatonin in their bodies that occurs over time. You can also use it for insomnia and other sleep disorders. Read on to learn how to use melatonin.
eHow Health Editor