S. Justin Thomas, PhD, breaks down myths and facts associated with melatonin supplement usage on UAB (University of Alabama, Birmingham) News.

Melatonin does work to help with sleep. The best evidence for the use of melatonin is in determining the timing of sleep (e.g., whether you begin to feel sleepy at 10 p.m. or 2 a.m.). Specifically, in small doses, it is useful in shifting an individual’s circadian rhythm; but there is less evidence to support its use in helping people to fall asleep.