Does Melatonin help sleep? (Grade B evidence)
Melatonin probably helps sleep (Grade B, moderate certainty). Studied doses: 0.5–3 mg.
Exact question reviewed
- Population
- not reported
- Intervention
- Melatonin · 0.5–3 mg
- Comparator
- not reported
- Outcome
- sleep
- Time horizon
- not reported
Bottom line. Melatonin probably helps sleep (Grade B, moderate certainty). Studied doses: 0.5–3 mg. [2 RCTs]
- Direction
- benefit
- Magnitude
- reduces time to fall asleep; best for circadian timing
- Grade
- B
- Certainty
- moderate
- Clinical meaning
- small but potentially useful
- Who it applies to
- —
- Dose / form studied
- 0.5–3 mg
- Safety
- uncertain_with_ssri
- The one limitation
- Claim-specific limitation details are not available in this public record.
Reviewed · Evidence last changed · Claim clm_ec_mel_sleep v0
⚠ Safety in context
- uncertainwith SSRI: Melatonin with an SSRI: possible additive sedation; evidence is thin. full interaction →
Grade B / moderate: probably helps, and new studies are unlikely to reverse this — but could shrink the effect size.
Who it works for
The studied population is not reported in this public record. Recorded studied dose: 0.5–3 mg.
Evidence
| Study | Design | Role | Cite |
|---|---|---|---|
| Meta-analysis: melatonin for the treatment of primary sleep disorders | peer-reviewed | not classified | PMID:23691095 · DOI |
| Effects of exogenous melatonin on sleep: a meta-analysis. | peer-reviewed | not classified | PMID:15649737 |
Why this grade
Reasoning trace
The current record stores Grade B at moderate certainty and links 2 publishable sources. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.
Audit and version
- Claim ID
- ec_mel_sleep
- Claim version
- not reported
- Governance
- legacy, not verified
- Last evidence search
- not reported
- Last editorial review
- 2026-07-16T04:28:37.106Z
Dose & form
Studied intake: 0.5–3 mg.
People say · Evidence shows
“Taking more melatonin makes sleep deeper”
Evidence: Grade B — reduces time to fall asleep; best for circadian timing.
How it stacks up for sleep
- Melatonin vs Ashwagandha for sleep — Ashwagandha Grade C
- Melatonin vs Magnesium for sleep — Magnesium Grade C
- Melatonin vs 5-HTP for sleep — 5-HTP Grade C
- Melatonin vs Glycine for sleep — Glycine Grade C
- Melatonin vs Valerian for sleep — Valerian Grade C
- Melatonin vs L-Theanine for sleep — L-Theanine Grade C
- All interventions graded for sleep →
Grade history
- B → BMerged additional source by Claude (gold-standard provenance sweep): a distinct, independently-verified paper ("Effects of exogenous melaton details →
- B → BCorrection by Claude (gold-standard provenance sweep): live Postgres source drift replaced with the verified seed source set [pmid:23691095] details →
Re-review cadence: every 12 months (Grade A/B) · next scheduled by · methodology v1.
Frequently asked
How long does Melatonin take to work for sleep?
Trials of Melatonin for sleep typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.
What dose was used in studies of Melatonin for sleep?
Studied doses for Melatonin in sleep trials cluster around 0.5–3 mg. See the dose block for the specific range and how it varies by form.
Does Melatonin work for sleep if I'm not deficient?
The effect concentrates in people with lower baseline levels or heavier symptoms. If your baseline is normal, expect a smaller effect than the trial averages.
Melatonin or the next-best alternative for sleep?
See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.
Related
What this is — and is not
- Evidence description
- reduces time to fall asleep; best for circadian timing
- Substrate's interpretation
- The current reviewed record assigns Grade B at moderate certainty. A domain-by-domain rationale is shown only when recorded.
- Discuss with a clinician
- If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
- Individualized medical advice
- Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.
Cite this page
Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.
Plain-text citation
Substrate. Does Melatonin help sleep? (Grade B). https://evidencebased.info/interventions/melatonin/sleep. Updated 2026-07-16.
BibTeX
@misc{substrate_ntionsmelatoninsleep,
author = {Substrate editorial},
title = {Does Melatonin help sleep?},
year = {2026},
url = {https://evidencebased.info/interventions/melatonin/sleep},
note = {Grade B, evidencebased.info}
}Found something wrong on this page? Report an error →