“…Melatonin may be used for the management of sleep disorders, such as insomnia and the disorder arising from night or shift work [Cardinali et al 2011;Fares, 2011;Hardeland et al 2008;Khan et al 2011;Malow et al 2012;Morin et al 2007;Ochoa-Sanchez et al 2011;Skene and Arendt, 2006;Srinivasan et al 2008Srinivasan et al , 2011a. When endogenous melatonin secretion is decreased, such as in people of advanced age or in those who use β blockers [Fares, 2011], or the natural circadian rhythm of melatonin is affected, such as in shift workers or people who are blind [Khan et al 2011], exogenous melatonin administration may improve the quality and duration of sleep. In patients with insomnia, melatonin seems to induce the onset of sleep, however its hypnotic action is mild.…”