Melatonin reduces sleep onset latency by approximately 7 minutes in adults with primary sleep disorders
A comprehensive meta-analysis of 19 RCTs (1,683 participants) found melatonin reduces sleep latency by ~7 minutes and increases total sleep time by ~8 minutes. Effects are more pronounced in older adults and those with circadian rhythm disruptions.
Evidence Score
Mechanism Graph
Limitations
- ⚠Effect size is modest (7 min reduction in latency)
- ⚠Quality of evidence varies across trials
- ⚠Optimal dosing remains debated (0.5mg vs 3mg vs 10mg)
- ⚠Long-term safety data (>6 months) limited
- ⚠Potential for morning grogginess at higher doses
Frequently Asked Questions
Does melatonin actually work for sleep?▼
Yes, but the effect is modest. A meta-analysis of 19 RCTs shows melatonin reduces sleep latency by ~7 minutes and improves overall sleep quality. It's most effective for circadian issues like jet lag.
What is the best dose of melatonin?▼
Lower doses (0.3-1mg) are often as effective as higher doses for sleep onset. The prolonged-release 2mg formulation is FDA-approved for adults 55+. Avoid doses above 5mg unless directed by a physician.
Is melatonin safe long-term?▼
Melatonin has a good safety profile for short-term use (weeks to months). Long-term safety data beyond 6 months is limited. Consult a doctor for chronic use.
Does melatonin cause dependency?▼
Melatonin does not appear to cause physical dependence or withdrawal. However, psychological dependence is possible. It's recommended to use it intermittently or for short periods.
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Products
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