Melatonin for Sleep Quality

Research suggests that melatonin supplementation is associated with meaningful improvements in certain aspects of sleep quality, though the evidence is nuanced and varies considerably depending on the population studied. Multiple meta-analyses and systematic reviews — drawing on dozens of randomized controlled trials — find the most consistent support for melatonin's benefits in people with respiratory diseases, metabolic disorders, autism spectrum disorder, and ADHD, while evidence for its effectiveness in adults with primary chronic insomnia or mental health disorders is weaker or not statistically significant; notably, children and adolescents with insomnia appear to respond more favorably than adults. Studies indicate that tart cherry juice, a natural dietary source of melatonin, may also modestly support sleep duration and efficiency, and emerging preclinical research points to potential roles for melatonin in circadian regulation and conditions linked to poor sleep. However, reviewers consistently note that key practical questions — including optimal dosing, timing, and formulation — remain unresolved, and the high variability across studies means that overall findings should be interpreted with caution rather than taken as definitive.