Withings Sleep Analyzer (Under-Mattress Pad)
Best for: No-wearable tracking, snore + apnea signals
The wear-nothing tracker — a pad under your mattress that tracks sleep stages, snoring and apnea signs with medical-grade heritage.
For people who refuse to wear anything to bed, the Sleep Analyzer is the answer: a thin pneumatic strip slides under the mattress and tracks sleep cycles, heart rate, snoring and breathing-disturbance patterns automatically, every night, forever. Withings is a medical-device company (its analyzer is CE-marked for apnea detection in Europe), and there's no subscription. It only tracks one side of the bed and can't move with you.
Price & where to buy
Prices checked 2026-10-31Prices shown were last checked on 2026-10-31 and can change at any time — the price on the retailer's site at checkout is the one that applies. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the price at our recommended retailer as at our last check of that offer (2026-10-31) and, when Amazon reports one, its list price for comparison. Amazon prices come from Amazon's own product data service and are refreshed twice a day; each one shows the date and time Amazon gave it, and one older than 24 hours is replaced by “Check price”. Other retailers' prices are checked by hand and show the date of that check. Retail prices move constantly, so the price on the retailer's own page at checkout is the one that applies. More on Amazon prices
Should you buy it?
What we like
- Track sleep wearing nothing
- Best-in-class snore + breathing detection
- No subscription, no charging ever
- Medical-device brand pedigree
What to know before buying
- Tracks one side of the bed only
- Can't travel with you
- No daytime/activity data
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At a glance
How it scores
How our 8.3/10 breaks down — rated on the dimensions that matter most for sleep trackers, from published specifications and third-party test data, not the marketing.
Featured in our guides
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Compare with alternatives
Quick verdicts for the sleep trackers most often considered alongside the Withings Sleep Analyzer (Under-Mattress Pad).
Withings Sleep Analyzer (Under-Mattress Pad) vs Oura Ring 4
The most comfortable passive sleep tracker on the market — if you can stomach the monthly subscription.
→ Passive trackers, women's health tracking, athletes wanting recovery data
Oura Ring 4 review →Withings Sleep Analyzer (Under-Mattress Pad) vs RingConn Gen 2 Smart Ring
The no-subscription Oura rival — sleep-apnea alerts, 12-day battery and a charging case, with zero monthly fee.
→ Oura features without the monthly fee, long battery
RingConn Gen 2 Smart Ring review →Withings Sleep Analyzer (Under-Mattress Pad) vs Apple Watch Series 10
Discontinued — Apple's current lineup is Series 12, Ultra 4 and SE 3. Still the strongest sleep-tracking smartwatch for iPhone users if you find remaining stock, but buy a current Apple Watch instead unless the discount is steep.
→ Existing owners, discounted-stock buyers comparing against current models
Apple Watch Series 10 review →Not sure which one is right for you?
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Editor's deep dive
Is the Withings Sleep Analyzer worth it?
The short answer
The Withings Sleep Analyzer is worth its price if you want sleep and breathing data without wearing anything. A pad slides under the mattress and tracks stages, heart rate, snoring and breathing disturbances with no charging and no subscription. It covers one side of the bed only, and its apnea feature is a screening signal rather than a diagnosis.
Who it's for
People who will not wear a ring or a watch to bed — which is a larger group than the wearables market admits — and people who specifically want snoring and breathing data rather than step counts. It suits a fixed bed and a consistent sleeping side. It suits couples badly unless you buy two. And it suits anyone who resents subscriptions: Withings charges nothing to see your own data, which is unusual in a category where Oura and Whoop both charge monthly.
Best for you if…
This is the product's entire reason to exist, and nothing else in the category does it as well at this price.
Snore and breathing-disturbance detection is the strongest part of the feature set — better than wrist wearables — provided you treat the output as a screening signal.
It reads only the side it sits under. Workable if one partner wants the data; otherwise you are buying two pads at double the cost.
It lives under a specific mattress. A ring or a watch is the right form factor if your bed changes.
No daytime tracking at all. This is a bed sensor, not a wearable — pair it with a watch or pick Oura or Whoop instead.
Every metric is free in Health Mate. Over three years that is a real saving against Oura's membership and far more against Whoop's.
Bottom line
The best answer to "I want the data but I refuse to wear anything." The trade is mobility and coverage: it stays with the bed, so it does not travel, and it reads one side of the mattress, so a shared bed needs two units. Treat the apnea capability precisely — it is CE-marked for apnea detection in Europe and is NOT FDA-cleared in the United States, so in the US it is best understood as a well-built screening signal that might prompt a conversation with a doctor. If it flags disturbed breathing consistently, that is a reason to seek a proper sleep study, not a reason to self-diagnose.
How we scored this
Synthesis review. Sources: Withings' published technical specifications and regulatory status, the company's CE marking documentation for apnea detection, independent comparisons of under-mattress ballistocardiography against polysomnography, and aggregated public owner consensus across 9,200+ ratings. Scored on the sleep-tracker criteria used across this category — accuracy, battery, app and insights, comfort, value — with comfort scoring maximum because wearing nothing is the product's defining property. We have NOT slept with this device: SleepyHero runs no first-hand product testing and makes no such claim, and we have not independently validated its staging or apnea accuracy. Reviewer signoff by Logan Foley, CSSC pending.
Sources
- [1] Edouard, P., et al. (2021). Validation of the Withings Sleep Analyzer, an under-the-mattress device for the detection of moderate-severe sleep apnea syndrome. Journal of Clinical Sleep Medicine, 17(6), 1217-1227. The manufacturer-independent validation behind the apnea-screening claim.
- [2] Kapur, V.K., et al. (2017). Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea. Journal of Clinical Sleep Medicine, 13(3), 479-504. American Academy of Sleep Medicine guidance — why a consumer screening signal is not a diagnosis.
Frequently asked questions
How can a pad track sleep?
Pneumatic sensors read micro-movements, heartbeat and breathing through the mattress — no contact needed. Accuracy rivals wrist wearables for staging and beats them for snore/breathing detection.
Does it detect sleep apnea?
It flags breathing-disturbance patterns and is CE-marked for apnea detection in Europe (not FDA-cleared in the US). A strong screening signal, not a diagnosis.
Two people in the bed?
It tracks the side it's under — buy two for a couple, or place under the sleeper who wants data.
Subscription?
None — all metrics free in the Health Mate app, unusual and welcome.