Grade A
Strong evidence
Melatonin for sleep onset in children with autism spectrum disorder: a double-blind randomised controlled trial
A 13-week multi-site RCT found that prolonged-release melatonin (2 mg) reduced sleep onset latency by 39 minutes compared to placebo in children aged 4–11 with ASD. Secondary outcomes showed improved total sleep time (+57 min) and fewer night wakings. No serious adverse events were reported.
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