メラトニン：入眠困難

Q: Does メラトニン help with 入眠困難?

Based on 30 studies with 10,634 participants, there is strong evidence from multiple clinical trials that メラトニン may support 入眠困難 management. Our evidence grade is A (Strong Evidence).

Q: How much メラトニン should I take for 入眠困難?

Studies have used various dosages. A commonly studied range is 0.5-3 mg, 30-60 min before bed. Always consult your healthcare provider before starting any supplement regimen.

Q: Are there side effects of メラトニン?

Reported side effects may include Daytime drowsiness, Headache, Dizziness, Nausea. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

Q: How strong is the evidence for メラトニン and 入眠困難?

We rate the evidence as Grade A (Strong Evidence). This rating is based on 30 peer-reviewed studies with 10,634 total participants. The overall direction of effect is positive.

合計10,634名の参加者を対象とした30件の研究（メタアナリシス7件、RCT 6件を含む）に基づく。30件中19件の研究で肯定的な効果が示されている。

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結論

Melatonin is strongly supported by research as a supplement that may help you fall asleep faster, which is one of its best-established benefits.

30 studies with 10,634 participants, including 7 meta-analyses and 6 RCTs
About 63% of studies confirm melatonin helps reduce the time it takes to fall asleep
Dose-response meta-analyses have helped identify effective dosing ranges
Recognized in clinical guidelines for both adults and children

Key Study Findings

review

Pediatric Insomnia.

Dose: Melatonin (various doses), CBT-I (behavioral), pharmacologic options (z-drugs, other) vs: Placebo 効果: CBT-I most effective treatment; melatonin beneficial in children with ASD or ADHD; limited evidence None

review

Unraveling the connection between the Mediterranean diet and sleep health: from biological mechanisms to clinical …

Dose: Mediterranean diet (high adherence vs. low adherence); polyphenols, omega-3, fiber as key components vs: Placebo 効果: None None

Review

The Efficacy of Melatonergic Receptor Agonists Used in Clinical Practice in Insomnia Treatment: Melatonin, Tasimelteon, …

Dose: None vs: Placebo 効果: None None

animal study (preclinical)

The therapeutic potential of Ziziphi Spinosae Semen and Polygalae Radix in insomnia management: Insights from …

Dose: not specified (intragastric administration) vs: Placebo 効果: None None

Meta-Analysis n=1689 Double-blind

Optimizing the Time and Dose of Melatonin as a Sleep-Promoting Drug: A Systematic Review of …

Dose: melatonin (various doses, peak efficacy at 4 mg/day) vs: Placebo 効果: Melatonin reduces sleep onset latency and increases total sleep time, peaking at 4 mg/day; insomnia insomnia status p<0.001; time

animal study (preclinical) 4 weeks

Shen Yuan extract exerts a hypnotic effect via the tryptophan/5-hydroxytryptamine/melatonin pathway in mice.

Dose: 0.5 g/kg and 1.0 g/kg intragastrically vs: Placebo 効果: None None

Key Statistics

研究数

10634

参加者数

↑

Positive

グレード

Referenced Papers

Pediatric Insomnia. Review

Pediatrics in review 2026

The Efficacy of Melatonergic Receptor Agonists Used in Clinical Practice in Insomnia Treatment: Melatonin, Tasimelteon, Ramelteon, Agomelatine, and Selected Herbs. Review

Molecules (Basel, Switzerland) 2025 2 件の引用

Unraveling the connection between the Mediterranean diet and sleep health: from biological mechanisms to clinical implications. Review

Sleep & breathing … 2025

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 … 2024 31 件の引用

European expert guidance on management of sleep onset insomnia and melatonin use in typically developing children. Review

European journal of … 2024 19 件の引用

The therapeutic potential of Ziziphi Spinosae Semen and Polygalae Radix in insomnia management: Insights from gut microbiota and serum metabolomics … Other

Journal of ethnopharmacology 2024 13 件の引用

Shen Yuan extract exerts a hypnotic effect via the tryptophan/5-hydroxytryptamine/melatonin pathway in mice. Other

Journal of ethnopharmacology 2024 13 件の引用

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 … 2023 17 件の引用

Efficacy of melatonin for chronic insomnia: Systematic reviews and meta-analyses. Meta-Analysis

Sleep medicine reviews 2022 48 件の引用

The Effects of the Exogenous Melatonin on Shift Work Sleep Disorder in Health Personnel: A Systematic Review. Systematic Review

International journal of … 2022 25 件の引用

Evening wear of blue-blocking glasses for sleep and mood disorders: a systematic review. Systematic Review

Chronobiology international 2021 47 件の引用

Efficacy of melatonin for sleep disturbance in middle-aged primary insomnia: a double-blind, randomised clinical trial. RCT

Sleep medicine 2020 41 件の引用

A combination of melatonin, vitamin B6 and medicinal plants in the treatment of mild-to-moderate insomnia: A prospective pilot study. Other

Complementary therapies in … 2019 26 件の引用

Long-Term Efficacy and Safety of Pediatric Prolonged-Release Melatonin for Insomnia in Children with Autism Spectrum Disorder. RCT

Journal of child … 2018 133 件の引用

Insomnia in Elderly Patients: Recommendations for Pharmacological Management. Review

Drugs & aging 2018 131 件の引用

Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice … Other

Journal of clinical … 2017 1097 件の引用

Efficacy and Safety of Pediatric Prolonged-Release Melatonin for Insomnia in Children With Autism Spectrum Disorder. RCT

Journal of the … 2017 245 件の引用

Circadian Rhythm Sleep-Wake Disorders. Review

Continuum (Minneapolis, Minn.) 2017 132 件の引用

Insomnia: Pharmacologic Therapy. Review

American family physician 2017 124 件の引用

Disruption of adolescents' circadian clock: The vicious circle of media use, exposure to light at night, sleep loss and risk … Review

Journal of physiology, … 2016 238 件の引用

Pharmacological interventions for sleepiness and sleep disturbances caused by shift work. Meta-Analysis

The Cochrane database … 2014 131 件の引用

Meta-analysis: melatonin for the treatment of primary sleep disorders. Meta-Analysis

PloS one 2013 447 件の引用

Circadian rhythm abnormalities. Case Report

Continuum (Minneapolis, Minn.) 2013 172 件の引用

To sleep or not to sleep: a systematic review of the literature of pharmacological treatments of insomnia in children and … Systematic Review

Journal of child … 2013 56 件の引用

Melatonin and its analogs in insomnia and depression. Review

Journal of pineal … 2012 322 件の引用

Effects of a tart cherry juice beverage on the sleep of older adults with insomnia: a pilot study. RCT

Journal of medicinal … 2010 157 件の引用

Efficacy and clinical safety of ramelteon: an evidence-based review. Review

Sleep medicine reviews 2008 46 件の引用

Self-reported efficacy and tolerability of ramelteon 8 mg in older adults experiencing severe sleep-onset difficulty. RCT

The American journal … 2007 41 件の引用

Melatonin in sleep disorders and jet-lag. Review

Neuro endocrinology letters 2002

Melatonin and insomnia. RCT

Journal of sleep … 1996 95 件の引用

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

一般的な使用量

general:: 0.5-3 mg, 30-60 min before bed
jetlag:: 0.5-5 mg

上限量： No established UL; 5 mg typically considered maximum

研究で検討された用量

用量	期間	効果	N
Melatonin (various doses), CBT-I (behavioral), pharmacologic options (z-drugs, other)	--	Positive	--
Mediterranean diet (high adherence vs. low adherence); polyphenols, omega-3, fiber as key components	--	Positive	--
None	--	Positive	--
not specified (intragastric administration)	--	Positive	--
melatonin (various doses, peak efficacy at 4 mg/day)	--	Positive	1689
0.5 g/kg and 1.0 g/kg intragastrically	4 weeks	Positive	--
low-dose melatonin administered 30-60 min before bedtime	--	Positive	--
variable (prolonged-release melatonin; ramelteon standard doses)	--	Positive	4875

推奨摂取タイミング： 30-60 minutes before bed

Safety & Side Effects

報告されている副作用

⚠ Daytime drowsiness
⚠ Headache
⚠ Dizziness
⚠ Nausea
⚠ Vivid dreams or nightmares

既知の相互作用

● Blood thinners (warfarin) — may increase bleeding risk
● Immunosuppressants — melatonin may stimulate immune function
● Diabetes medications — may affect blood sugar levels
● Sedatives and CNS depressants — additive drowsiness

耐容上限摂取量： No established UL; 5 mg typically considered maximum

サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。

Frequently Asked Questions

Does メラトニン help with 入眠困難?

Based on 30 studies with 10,634 participants, there is strong evidence from multiple clinical trials that メラトニン may support 入眠困難 management. Our evidence grade is A (Strong Evidence).

How much メラトニン should I take for 入眠困難?

Studies have used various dosages. A commonly studied range is 0.5-3 mg, 30-60 min before bed. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of メラトニン?

Reported side effects may include Daytime drowsiness, Headache, Dizziness, Nausea. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for メラトニン and 入眠困難?

We rate the evidence as Grade A (Strong Evidence). This rating is based on 30 peer-reviewed studies with 10,634 total participants. The overall direction of effect is positive.

Related Evidence

に関する他の成分：入眠困難

ビタミンB6 A グリシン酸マグネシウム A 亜鉛 A Hops A L-テアニン A アピゲニン B

メラトニン他の症状・状態について

不眠症 A 概日リズム障害 A 時差ぼけ A 交代勤務睡眠障害 A 加齢に伴う睡眠の変化 B

総合評価

合計10,634名の参加者を対象とした30件の研究（メタアナリシス7件、RCT 6件を含む）に基づく。30件中19件の研究で肯定的な効果が示されている。

Evidence Strength92%

High confidence

研究の内訳

RCT (6)Meta (5)Other (19)

代替成分との比較

この症状に対する他の成分との比較をご覧ください。

に関するすべての成分を見る：入眠困難

詳しく見る

FDAに関する免責事項: これらの記述は米国食品医薬品局（FDA）による評価を受けていません。本ウェブサイトの製品および情報は、疾病の診断、治療、治癒、または予防を目的としたものではありません。表示されているエビデンスグレードは、公開された査読済み研究の分析に基づいており、医療上の助言を構成するものではありません。サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。

メラトニン ： 入眠困難