Dietary supplements as insomnia treatments

Various dietary supplements have been touted as effective insomnia treatments. The most widely publicized may be the hormone melatonin.
Melatonin is thought to help control your body's internal clock. The melatonin supplements most often found in health food stores and pharmacies are synthetic versions of the natural hormone. These supplements may help some people fall asleep or stay asleep. Melatonin can sometimes help prevent jet lag as well.
There are many unanswered questions about melatonin. Some people who've taken melatonin have reported drowsiness, headaches and stomach discomfort. Confusion, decrease in body temperature and seizures are also possible, as well as many drug interactions. The optimal dose isn't certain, and the long-term effects are unknown.
Other supplements — such as valerian, chamomile and kava — have yet to be fully studied for safety or effectiveness in relieving insomnia.