We're running an independent study to find out. Track 4 nights of sleep with your existing wearable. We provide the mouth tape. You provide the data. Together, we get real answers.
Every participant receives a full bag of Sleep Karma Bamboo Silk Mouth Tape (30 strips) — just cover $6.95 shipping. Enough for the study and weeks of continued use.
Search for "mouth tape sleep" and you'll find thousands of anecdotes, influencer endorsements, and product claims. What you won't find is a straightforward, independently conducted study measuring whether it actually moves the needle on objective sleep metrics.
That's what this study aims to produce. Not a clinical trial — a structured, transparent consumer study using the sleep trackers people already wear. Real participants. Real devices. Published methodology. And results we'll share regardless of what they show.
A checkerboard design where you alternate between tape and no tape. Each person is compared against themselves — the gold standard for eliminating individual variation.
Sleep normally. Submit your sleep score in the morning.
Apply tape before bed. Submit your score in the morning.
Back to normal. Submit your sleep score in the morning.
Final night. Submit your score — you're done!
This study uses a within-subject crossover design. Instead of comparing Person A (who tapes) against Person B (who doesn't), we compare each person against themselves. Night 1 vs. Night 2 for the same sleeper, same bed, same tracker.
The alternating pattern also reduces order effects and novelty bias. If someone sleeps better on Night 2 just because they're excited about trying something new, Night 3 (no tape) resets, and Night 4 (tape again) tests whether the effect holds.
| Night | Condition | What You Do | Morning Task |
|---|---|---|---|
| 1 | Control | Sleep as normal — no tape | Submit score + screenshot |
| 2 | Treatment | Apply mouth tape before bed | Submit score + screenshot |
| 3 | Control | Sleep as normal — no tape | Submit score + screenshot |
| 4 | Treatment | Apply mouth tape before bed | Submit score + screenshot |
We use paired statistical tests (paired t-test or Wilcoxon signed-rank) to compare tape vs. no-tape nights across all participants. We report confidence intervals and effect sizes — not just averages. If results are null, we publish that too.
All data comes from your existing wearable. No new hardware required.
Enter your email and tell us which sleep tracker you use. Takes 60 seconds.
We ship you a free bag of Sleep Karma mouth tape. You just cover shipping ($6.95).
Follow the protocol. Each morning, submit your sleep score via a quick form (90 seconds).
Get early access to the aggregate findings before we publish them publicly.
This isn't a sales funnel disguised as science. It's an independent study that happens to come with some nice benefits.
A full bag of Sleep Karma bamboo silk mouth tape — 30 strips. Enough for the study and then some. You just pay $6.95 shipping.
See the aggregate findings before anyone else. How did your nights compare to the group? Did mouth taping move the needle?
See your personal tape vs. no-tape comparison. It's one thing to read about mouth taping — it's another to see your own numbers.
Evident is an independent health research platform. We evaluate products, run studies, and publish findings — whether positive, negative, or mixed. Sleep Karma is supplying the mouth tape for this study, but the research is designed and published by Evident. We report what the data shows, period.
The mouth tape itself is free. The $6.95 covers the actual cost of shipping the product to you. We're not making money on this — it just allows us to run the study without it being a net loss on every participant.
Any wearable that gives you a nightly sleep score: Oura Ring, Apple Watch, Whoop, Garmin, Fitbit, Samsung Galaxy Watch, or similar. You just need to be able to see a sleep score each morning and screenshot it. If you're not sure if your device qualifies, sign up and we'll confirm.
Sleep Karma's mouth tape is ISO 10993-1 certified for biocompatibility, uses medical-grade hypoallergenic adhesive from Henkel (Germany), and is PFAS-free. It's designed specifically for nightly skin contact. That said, if you experience any irritation, stop using it and let us know.
Your data is anonymized and aggregated for the published study. We never share individual data publicly unless you explicitly consent to be featured as a case study. You can withdraw at any time. We use your email only for study communications and results — no spam, ever.
Four nights. Each morning you spend about 90 seconds submitting your sleep score. Total time commitment: under 10 minutes across the entire study. Plus a brief exit survey on day 5.
We publish it anyway. Evident's credibility is built on transparency, not on producing favorable results. A null finding is still valuable — and still publishable. The goal is truth, not marketing.
4 nights. Real data. Free mouth tape. Limited spots available.
By signing up you agree to participate in the 4-night study and to share anonymized sleep data. We'll email you next steps within 24 hours. No spam — ever.
