Summary of Melatonin
August 12th, 2026
Melatonin is a natural hormone synthesized and secreted by the brain at night to help with sleep initiation. It’s secretion is entrained to the light-dark cycle by the suprachiasmatic nucleus of the hypothalamus within the human brain. Displays that emit blue wavelengths of light (eg, iPhone, TV, computer screens, laptops, etc) inhibit the secretion of melatonin which accounts for technology-induced insomnia observed in many children and adults today.
Fortunately, melatonin is readily available as an over-the-counter medication that can help individuals with insomnia albeit at a modest efficacy with an expected reduction in sleep latency by roughly 5-8 minutes. As a precaution, individuals who have frequent nightmares (eg, PTSD-related nightmares, nightmare disorder, etc) should avoid melatonin due to a potential side effect of vivid dreams.
If you’d like to purchase melatonin supplements, please visit the affiliate link below.
This product linked is dosed at 3mg per capsule, therefore 1 capsule (3mg) nightly 2 hours prior to sleep onset would be sufficient per dosing guidelines.
As a disclaimer, qualified purchases will go towards to an Amazon Associate account which in turn helps to keep this website going. Thank you!
What dose of Melatonin should I use?
For initial insomnia (eg, difficulty with sleep initiation)
Evidence shows that 3-4mg is sufficient, with doses higher causing more potential for adverse effects (eg, vivid dreams, drowsiness).
A 2024 dose-response meta-analysis (26 RCTs) found efficacy for reducing sleep-onset latency and increasing total sleep time increases with dose, peaking at ~4 mg/day, with no additional benefit beyond that. It also suggested that administering melatonin around 2 hours before desired bedtime (rather than the usual 30 minutes) optimizes effect, and that response is blunted in insomnia patients relative to healthy volunteers
For comorbid/neuropsychiatric-related insomnia (eg, insomnia due to a mental illness)
An international expert panel suggested prolonged-release melatonin 2–10 mg, 1–2 hours before bedtime, with immediate-release <1 mg being better suited to circadian sleep disturbances.
What are the guidelines for Melatonin?
Guidelines on the use of melatonin include:
The AASM (2017) issued a conditional recommendation against melatonin for sleep-onset or sleep-maintenance insomnia in adults, citing weak evidence. [2-3]
The British Association for Psychopharmacology recognizes prolonged-release melatonin as improving sleep-onset latency and quality in patients >55 years. [9]
Melatonin is better established for circadian applications (jet lag, shift work) and REM sleep behavior disorder than for primary insomnia.
What are side effects and/or precautions of Melatonin?
Melatonin is generally well tolerated with a benign side-effect profile (mild somnolence, fatigue), which is part of its appeal relative to standard hypnotics. However, individuals who have frequent nightmares (eg, PTSD-related nightmares, nightmare disorder, etc) should avoid melatonin due to a potential side effect of vivid dreams.
It is also advised to use standardized, reputable products, as over-the-counter (OTC) supplements are not FDA-regulated and may vary in purity and content.
Where can I purchase Melatonin?
If you’d like to purchase magnesium glycinate, please visit the affiliate link below.
This product linked is dosed at 120mg per capsule, therefore taking 2-3 capsules (240-360mg) nightly would be sufficient per dosing guidelines.
As a disclaimer, qualified purchases will go towards to an Amazon Associate account which in turn helps to keep our website going. Thank you!
Sources
Management of Insomnia. The New England Journal of Medicine. 2024. Morin CM, Buysse DJ.Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline. Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine. 2017. Sateia MJ, Buysse DJ, Krystal AD, Neubauer DN, Heald JL.Climbing Melatonin Use for Insomnia Raises Safety Concerns. The Journal of the American Medical Association. 2022. Kuehn BM.Meta-Analysis: Melatonin for the Treatment of Primary Sleep Disorders. PloS One. 2013. Ferracioli-Oda E, Qawasmi A, Bloch MH.Efficacy of Melatonin and Ramelteon for the Acute and Long-Term Management of Insomnia Disorder in Adults: A Systematic Review and Meta-Analysis. Journal of Sleep Research. 2023. Maruani J, Reynaud E, Chambe J, et al.Efficacy of Melatonin for Chronic Insomnia: Systematic Reviews and Meta-Analyses. Sleep Medicine Reviews. 2022. Choi K, Lee YJ, Park S, Je NK, Suh HS.Optimizing the Time and Dose of Melatonin as a Sleep‐Promoting Drug: A Systematic Review of Randomized Controlled Trials and Dose−Response Meta‐Analysis. Journal of Pineal Research. 2024. Cruz-Sanabria F, Bruno S, Crippa A, et al.Melatonin, Melatonin Receptors and Sleep: Moving Beyond Traditional Views. Journal of Pineal Research. 2024. Comai S, Gobbi G.Insomnia. Lancet. 2022. Perlis ML, Posner D, Riemann D, et al.International Expert Opinions and Recommendations on the Use of Melatonin in the Treatment of Insomnia and Circadian Sleep Disturbances in Adult Neuropsychiatric Disorders.