Modifications: No serious side effects have been reported with Melatonin treatment at the above doses. Higher doses (70mg/day) have been used in children with muscular dystrophy with no adverse events. Occasionally excessive daytime sleepiness has been reported which should be reported as an adverse event. This usually resolves in a few days. Treatment should continue unless the sleepiness is problematic for more than 3 days in which case half a tablet may be tried (after reporting this to the study team).