Melatonin is a hormone produced in the pineal gland of mammals that aids in the regulation of sleep/wake cycles.

Melatonin can be used as a sleep aid for relief of occasional sleeplessness. Melatonin helps establish normal sleep patterns to promote a more restful, relaxing sleep and better overall health.

Melatonin Articles:

http://www.nlm.nih.gov/medlineplus/druginfo/natural/patient-melatonin.html