Melatonin
Melatonin is widely marketed as a sleep aid, but its benefits are often modest for people with ordinary insomnia. While it can help regulate circadian rhythms, many people find that it does not consistently improve sleep quality or help them stay asleep throughout the night. Use of melatonin to suggest to the body that it is time to sleep can be helpful for jet lag and inconsistent sleeping schedules, however, it lacks actual physiological and psychological calming effects. Despite popular belief, the sedative effects are nonexistent.