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Melatonin is a hormone made by the pineal gland in the brain. Melatonin is involved in sleep and wake cycles. Very small amounts of it are found in some foods, including fruits and vegetables. Our body clock controls the amount of melatonin the body produces. In a normal cycle, melatonin levels rise in the mid-to-late evening, remain elevated during nighttime, and decrease in the early morning.
Light affects how much melatonin the body produces. During shorter days of the year, melatonin may be produced earlier or later in the day than usual. This change can interrupt normal sleep cycles and mood.
A 2007 randomized, double blind, placebo-controlled, parallel- group, multi-center study of 170 primary insomnia subjects evaluated the effect of 2mg of melatonin on reducing sleep latency (time to sleep) and improving sleep quality. The melatonin treatment group significantly improved quality of sleep and morning alertness without withdrawal symptoms upon discontinuation. A 2009 randomized, double-blind sleep laboratory phase 2 study of 40 subjects evaluated the effect of 2mg of melatonin on sleep measures and psychomotor performance. The study found that the treatment group had significantly shorter sleep onset latency compared with the placebo group and scored significantly better in the Critical Flicker Fusion Test. Half of the treatment subjects reported substantial improvement in sleep quality at home taking melatonin compared with 15% with placebo. Study researchers concluded that nightly treatment with melatonin effectively induced sleep.
- Prolonged-release melatonin improves sleep quality and morning alertness in insomnia patients aged 55 years and older and has no withdrawal effectsJournal of Sleep Research,2007
- The effect of prolonged-release melatonin on sleep measures and psychomotor performance in elderly patients with insomniaInternational Clinical Psychopharmacology,2009
Multiple placebo-controlled studies support melatonin’s impact on reducing the effects of jet lag in subjects crossing multiple time zones. This is in part due to melatonin's ability to regulate the body's circadian rhythm. Authoritative bodies in Europe and Canada have also established melatonin's ability to reduce the effects of jet lag.
- Preflight adjustment to eastward travel: 3 days of advancing sleep with and without morning bright lightJ. Biolog Rhythms,2003
- Effect of melatonin on jet lag after long haul flightsBMJ. ,1989
- Melatonin for the prevention and treatment of jet lag (Cochrane Review)The Cochrane Library, Issue 4,2001
- EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Scientific Opinion on the substantiation of health claims related to melatonin and alleviation of subjective feelings of jet lag (ID1953) , and reduction of sleep onset latency, and improvement of sleep quality (ID1953) pursuant to article 13(1) of Regulation (EC) No 1924/2006EFSA Journal,2010
- Monograph: Melatonin-Oral. 2013. Last Accessed 05/12/2018.Health Canada,2013