Melatonin and Sleep: Uses, Limits, and Safety Questions

Melatonin is a hormone involved in the body's sleep-wake timing. Supplements can shift that timing, but they are not a guaranteed cure for insomnia and do not replace evaluation of an underlying sleep disorder.

Where it may be useful

Evidence suggests melatonin can help with certain circadian-rhythm situations, such as jet lag or delayed sleep timing, and it may have a role in selected patients under professional guidance. Benefits for chronic insomnia are generally modest and vary by person, dose, timing, and product.

Questions about dose and timing

More is not necessarily better. The appropriate timing depends on the goal, and taking melatonin at the wrong time can shift the body clock in an unwanted direction. Because supplements are regulated differently from prescription drugs, the amount in a product may not always match the label.

Safety considerations

Possible effects include daytime sleepiness, headache, dizziness, and nausea. Melatonin may interact with medicines and may not be appropriate for everyone. Children, people who are pregnant or breastfeeding, and people managing chronic conditions should seek clinician guidance rather than self-treating. Long-term safety is not fully established.

Persistent difficulty sleeping, significant daytime impairment, or symptoms such as gasping and breathing pauses warrant medical evaluation.

Important: This article provides general education, not medical advice, diagnosis, or treatment. Talk with a qualified health professional about persistent symptoms, medications, supplements, or devices.

Sources

• National Center for Complementary and Integrative Health: Melatonin
• NCCIH: Sleep disorders and complementary approaches