For sleep... OTC Melatonin:
Melatonin is a hormone secreted by the pineal gland in the brain. It helps regulate other hormones and maintains the body's circadian rhythm. The circadian rhythm is an internal 24-hour “clock” that plays a critical role in when we fall asleep and when we wake up. When it is dark, your body produces more melatonin; when it is light, the production of melatonin drops. Being exposed to bright lights in the evening or too little light during the day can disrupt the body' s normal melatonin cycles. For example, jet lag, shift work, and poor vision can disrupt melatonin cycles.
http://www.umm.edu/altmed/articles/m...#ixzz2BvPngQwn