Try it: If you don’t feel tired until way past bedtime.
How to use it: Take a three-milligram tablet 15 to 20 minutes before bed. (Try GNC Melatonin 3; $6 for 60 tablets, gnc.com.) Your brain makes this neurohormone naturally to “tell the body that it’s time for sleep,” says Naiman. “But many people have suppressed melatonin production because they’re overexposed to light in the evening.” Naiman has been using it nightly for 20 years.
Good to know: Consult with your doctor before taking melatonin. It is not recommended for pregnant women, women trying to conceive, children, and adolescent boys (it can affect testosterone levels in maturing males).