Health Research DatabaseClaim-to-evidence tracking
HRD Claim Ledger · Living evidence brief

Does passive heating improve sleep?

Promising, protocol-sensitive

Passive heating before bedtime may improve sleep onset or subjective sleep quality in some studies, but timing and temperature matter. Evidence from warm baths, hot-water immersion and sauna should not be collapsed into a single protocol, and the small research base does not establish a universal effect.

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01
Evidence profile

What the evidence can—and cannot—support

Human evidenceLimited
Randomized evidenceLimited
ConsistencyPromising
ReplicationLimited
DirectnessModerate
Long-term outcomesVery limited
Important uncertainty

The optimal modality, temperature, timing and frequency remain uncertain.

02
Research Receipt

An auditable count, not “studies show”

Claim checkedA hot bath or sauna before bed improves sleep.
Dataset edition2026-09-18
4matched publications
1randomized trials
0reviews / meta-analyses
2registered trials
1active trials
Reproduce this receipt

Included: Records in the Passive heating topic whose high-signal metadata contains at least one outcome term below.

Outcome expression: "sleep" OR "insomnia" OR "bedtime" OR "circadian"

Excluded: Records outside the intervention topic, animal-only records rejected by the source query, and records without an outcome-term match. This is a reproducible index, not a systematic review.

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Matched publications

Why these records count

Each record matched the intervention topic and at least one claim-specific outcome term. Open a record for source metadata and inclusion provenance.

Trial Radar

Evidence that may change the answer

Registration is not a result. Status and dates come from ClinicalTrials.gov.

Cite this page

Make the evidence trail portable.

Health Research Database. “Does passive heating improve sleep?” HRD Claim Ledger. Dataset 2026-09-18. Accessed 2026-09-18.

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