Substrate ·evidence-based
interventions / Melatonin / sleep

Does Melatonin help sleep? (Grade B evidence)

Explore current source-reported research for this exact question. These records are separate from the synthesis below; they do not update its grade or establish a recommendation.

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 other]

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 not reported · Evidence last changed · Open evidence record (version 0)

⚠ Safety in context

Grade
B
what does the grade mean?
Certainty
moderate
what does certainty mean?

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

StudyDesignRoleCite
Meta-analysis: melatonin for the treatment of primary sleep disorderspeer-reviewednot classifiedPMID:23691095 · DOI
Effects of exogenous melatonin on sleep: a meta-analysis.peer-reviewednot classifiedPMID: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
Clinician review
Not yet reviewed by a licensed clinician
Last evidence search
not reported
Last editorial review
not verified

Public receipt · Machine-readable claim · Methodology

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

Grade history

Re-review cadence: every 12 months (Grade A/B) · methodology v1.

Frequently asked

How long does Melatonin take to work for sleep?

This record does not report a studied onset time for Melatonin and sleep. Do not assume a typical timeframe.

What dose was used in studies of Melatonin for sleep?

The recorded studied dose for Melatonin and sleep is 0.5–3 mg. This is a source detail, not a dose recommendation.

Does Melatonin work for sleep if I'm not deficient?

The studied population is not reported for Melatonin and sleep, so whether baseline status changes the effect is not known from this record.

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}
}

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Current source-reported research

Membership uses admitted intervention and measured-outcome associations for this exact question. Different populations, preparations, comparators and timepoints remain separate. No pooling or update to the synthesis is asserted.

1 paper with unavailable publication authority was omitted. Current findings are the verified subset of this bounded collection; this is not a complete literature search.