Far-infrared-emitting pajamas,
does it really help with Improved sleep quality in adults with poor sleep?
research showsThe grade is D with 30 points. In a 40-person double-blind sham-controlled trial, the prespecified PSQI changed from 9.50 to 8.34 with FIR pajamas and from 9.15 to 7.28 with sham at six weeks, numerically favoring sham. The between-group time effect was dppc2=-0.231, P=.255, and the overall time-by-group P value was .439. No confidence interval was reported, so meaningful benefit was not excluded, but this trial did not support the sleep claim.
ads claimA textile's infrared-emission property does not establish better sleep. This pajama trial found no added sleep benefit. Verdict 1459 is D with 27 points for far-infrared sauna in rheumatic symptoms, a different delivery method and indication.
Useful facts when choosing a product
- FIR pajamas combined cotton with physically modified emitting fiber; sham pajamas used appearance-matched ordinary fiber.
- Six-week PSQI was 8.34 with FIR and 7.28 with sham, P=.255.
- Verdict 1459 is D with 27 points for far-infrared sauna in a different indication.
Chamgap Semantic Classification Code
Candidate index · review held
UNK.pajamas-made-with-far-infrared-emitting-functional-textile.UNK.sleep-quality-with-poor-sleep.improve.shamUnknown > Pajamas made with far-infrared-emitting functional textile > Unknown > sleep quality with poor sleep > Improvement claim > Sham procedure or device
An automated migration candidate, not an issued permanent code; exact claim scope remains under review. This machine-generated migration candidate helps retrieval but is not a permanent assignment. The original verdict ID and URL remain authoritative.
What the research actually shows
The 2023 pilot RCT by Chen SC, Cheung TW, Yu BY, Chan MY, Yeung WF, and Li L randomized 40 participants, 20 per group. An independent researcher created a computer list with blocks of four to six; only the clothing-delivery staff member received allocation, while participants, assessors, and analysts were masked. GEE used all available data from 40 participants; 18 FIR and 17 sham participants completed six weeks. NCT04890002 and the article agree on PSQI as primary. Hong Kong Research Institute of Textiles and Apparel grant ITP/001/18TP funded the trial, and the authors reported no conflict and no funder role.
Why this is classified as D (30)
A nonprofit-funded double-blind trial had a null prespecified sleep endpoint and did not report a confidence interval. Without repeated refutation, this gives D with 30 points.
Counterpoint. Physical infrared emission and clinical sleep efficacy are separate questions.
Rejudgment record. Cross-check applied — Cross-checked the article and NCT record for PSQI prespecification, 40-person GEE analysis, time-specific effects and P values, randomization, masking, completer counts, nonprofit funding, and unreported 95% confidence interval
| Endpoint | P | Symptom or function itself is the target - including patient reports and performance tests |
| Replication | R1 | Single confirmatory trial |
| Independence | I2 | Decisive evidence is publicly or non-profit funded |
| Effect size | E0 | Null |
| Precision | CX | No pooled confidence interval could be confirmed |
Stored derived and displayed grades match; this is not a current recalculation or validity check (D).
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| Improved sleep quality over six weeks | D | The PSQI between-group P value was .255 and sham improved more numerically. |
| Improved sleep-diary outcomes | D | Seven-day sleep-diary outcomes also showed no significant between-group differences. |
Cross-check — AI research and Codex final gate
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Chen SC, Cheung TW, Yu BY, Chan MY, Yeung WF, Li L. 2023 | Double-blind parallel-group sham-controlled pilot RCT | 40 randomized and included in ITT GEE; 35 completed six weeks, 18/17 | Hong Kong Research Institute of Textiles and Apparel ITP/001/18TP | PSQI total score at weeks 2, 4, and 6 | Six-week dppc2=-0.231, P=.255; overall time-by-group P=.439; no 95% CI reported | Null prespecified primary endpoint in a small short pilot |
Receipt — 2 References
All 2 cited sources were verified for existence at the original page (as of 2026-08-15).
Final verification and publication gate: Codex · Evidence date: 2026-08-15 · Corrections: none
Cite this verdict
[Chamgap] Far-infrared-emitting pajamas x sleep quality — Evidence Grade D·30. 2 cited sources checked. Source: https://chamgap.com/en/verdicts/sleep/far-infrared-emitting-pajamas-poor-sleep-quality/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.