What is Melatonin? (Mayo Clinic)
More About Melatonin (Dr. Arlene Goldman)
Melatonin Info (UMM.edu)
Melatonin - Overview (WebMd.com)
Wellness Guide - Melatonin (UC Berkeley)
Melatonin for Treatment of Sleep Disorders (AHRQ.gov)
Melatonin and Sleep Disturbance in Children (KeepKidsHealthy.com)
The Best Natural Sleep Remedy: Melatonin (nutri.com)