http://articles.mercola.com/sites/articles/archive/2008/01/02/melatonin-part-two.aspxTaking melatonin does not appear to help workers on rotating shifts adjust to working nights, the findings from a US study suggest. Melatonin is thought to help regulate daily or "circadian" rhythms and the sleep-wake cycle. It is availableenCommunityServer 2008.5 SP1 (Build: 31106.3070)