2. Melatonin
Your body makes melatonin naturally, and it helps control your natural sleep cycle. Levels normally begin to rise in the middle to late evening, but the amount of melatonin your body makes can vary with the seasons, producing more in winter and less in summer. You also make less melatonin as you age. In addition, melatonin is a powerful antioxidant. Since most melatonin is short-acting, you shouldn't feel fatigued the next morning. According to WebMD, the supplemental dose can vary between 0.2 and 20.0 mg.