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The Withings Sleep Analyzer is a thin sensor mat that stays under a mattress and records sleep automatically. There is nothing to wear, charge each morning, or remember at bedtime. It estimates sleep duration and stages, tracks overnight heart rate, listens for snoring, and—in supported markets—screens for signs associated with sleep apnea.
The short verdict: it is a compelling set-and-forget tracker for one person who wants long-term sleep trends without jewelry or a watch. Its unobtrusive design and automatic syncing are the strengths. Single-person coverage, mattress compatibility, cloud dependence, and region-specific medical features require careful checking before purchase.
Product overview
| Feature | Withings Sleep Analyzer |
|---|---|
| Placement | Under mattress at chest level |
| Power | Mains powered |
| Connection | Wi-Fi for automatic sync |
| Tracks | Duration, interruptions, stages, heart rate, snoring |
| Apnea feature | Market and regulatory approval dependent |
| App | Withings app for iOS and Android |
| Price reference | £129.95 in Withings’ UK announcement in March 2026 |
Withings uses different names and feature sets by country, including Sleep Analyzer and Sleep Tracking Mat. Verify the exact product page for your location. A retailer importing European hardware does not necessarily make regulated apnea features available in another country.
How it works
The mat contains pneumatic and acoustic sensors. Placed beneath the mattress, it detects body movement, breathing-related motion, heart beats, and sound patterns. Algorithms translate those signals into a nightly record. It begins automatically when you get into bed and sends results to the Withings app over Wi-Fi.
That design eliminates wearable friction. You can shower, charge a phone, or forget about tracking entirely and still accumulate a consistent history. The mat remains plugged in, so there is no battery to run flat before a useful night.
It also creates limitations. The system associates a mat with one sleeper and one side. Couples generally need separate compatible mats for individual data, and each installation needs correct placement. It cannot follow you to a hotel unless you pack and recalibrate it.
Setup and calibration
Installation is straightforward but should not be rushed. Position the sensor horizontally under the mattress around chest level, connect power, add it in the Withings app, and join a supported Wi-Fi network. The mat inflates and calibrates during setup. Keep off the bed until calibration finishes.
Mattress and base construction matter. The sensor must be able to detect motion through the mattress and rest on a stable surface. Very thick mattresses, some adjustable arrangements, waterbeds, air beds, or unusual slatted bases can reduce compatibility. Follow Withings’ current placement guide rather than improvising above a topper.
Secure the cable where feet, pets, robot vacuums, and moving bed frames cannot catch it. If you change mattress, move the mat, or alter the base, recalibrate and check the next few nights for plausible results.
Wi-Fi is used for automatic uploads. A bedroom with weak signal may produce delayed syncing. The lack of a wearable display means the app and Withings’ service are central to the experience.
Sleep reports
Each morning, the app summarizes bedtime, wake time, sleep duration, time to fall asleep, interruptions, and estimated deep, light, and REM stages. It also produces a Sleep Score and can display trends across weeks.
The most useful information is usually schedule consistency and total sleep. A recurring late bedtime or multiple long awakenings provides something concrete to investigate. Exact stage minutes deserve less confidence. Like rings and watches, the mat infers stages without measuring the full set of signals used in clinical polysomnography.
Bed presence can confuse any passive tracker. Reading motionlessly, sharing the sensor zone with a pet, or leaving the bed for a period may lead to unusual records. Compare charts with what you remember and focus on repeated patterns rather than a single bad score.
Because tracking is automatic, the data set can be more complete than one produced by a device that needs daily charging. That consistency is the Sleep Analyzer’s real advantage.
Heart rate and snoring
The mat estimates continuous overnight heart rate. Resting patterns can help show how alcohol, illness, stress, exercise, or a late meal affects recovery. Look for personal changes over time rather than comparing your number with another person’s.
Movement and poor placement can reduce signal quality. This is not a bedside cardiac monitor. New palpitations, chest pain, fainting, or persistent abnormal readings need medical evaluation, not app troubleshooting.
An acoustic sensor identifies snoring episodes and presents their duration. That can help test whether side sleeping, congestion management, alcohol reduction, or a changed pillow coincides with less snoring. It may also capture a partner or environmental noise, so interpret it in context.
Snoring alone does not prove sleep apnea, and quiet sleepers can still have apnea. Symptoms such as witnessed breathing pauses, gasping, morning headaches, resistant high blood pressure, or severe daytime sleepiness warrant discussion with a healthcare professional.
Sleep-apnea detection and regional differences
In supported European markets, Sleep Analyzer offers medically regulated sleep-apnea detection using breathing disturbances, heart rate, and movement. That is a notable distinction from ordinary consumer “breathing score” features. Withings describes its detection as clinically validated, but availability and labeling depend on local authorization.
US buyers must be especially precise. The Withings product sold there may have a different name and may not include the same regulated apnea function. App availability, cleared features, and subscriptions can change after software updates or regulatory decisions.
Even an approved screening feature does not replace a clinician’s diagnosis or a prescribed sleep study. A result can guide a conversation, not determine treatment. Never start, stop, or modify apnea therapy based only on a consumer app.
Withings ecosystem and privacy
The app can combine sleep with data from Withings scales, watches, and blood-pressure monitors. This provides a useful longitudinal dashboard. Supported health-platform integrations can move selected data elsewhere.
The same convenience means sensitive sleep and health information is stored in an account and processed by cloud services. Enable strong account security, review connected services, and read the current privacy policy. Export and deletion options matter if you later leave the ecosystem.
Accuracy expectations
No consumer under-mattress tracker is perfectly accurate. The mat is well suited to detecting presence, broad timing, and overnight trends, but stage classifications and short awakenings can differ from laboratory results. A tracker can also change behavior through the expectation of a score—a phenomenon sometimes called orthosomnia when sleep-data anxiety becomes counterproductive.
Use the data to ask simple questions: Am I allowing enough time for sleep? Is my schedule stable? Did a habit consistently coincide with more interruptions? If checking the app increases anxiety, reduce review frequency or stop scoring experiments.
Pros and cons
Pros
- Nothing to wear or recharge
- Automatic, consistent tracking
- Useful schedule, heart-rate, and snoring trends
- Regulated apnea screening in supported markets
- Integrates with the broader Withings app
Cons
- One mat primarily covers one sleeper
- Features differ significantly by country
- Requires power, Wi-Fi, app, and cloud service
- Compatibility varies with mattress and base
- Stages remain estimates rather than clinical measurements
Who should buy it?
Buy the Withings Sleep Analyzer if you want passive tracking, sleep alone or can install one mat per person, and value long-term patterns more than live wearable features. It is particularly attractive to people who cannot tolerate a ring or watch overnight.
Skip it if you travel often, need workout tracking too, use an incompatible bed, or are buying specifically for apnea diagnosis without confirming local regulatory availability. A wearable is more portable; a formal sleep assessment is more appropriate for clinical questions.
Final verdict
The Withings Sleep Analyzer is successful precisely because it disappears. After correct installation, it records nights without adding another charging habit or object on the body. The sleep schedule, heart-rate, and snoring trends can support better questions and more consistent habits.
Its value depends on expectations. It is not a lab, its headline apnea capability is not universal, and its software ecosystem is part of the purchase. Confirm the model and approved features in your country, check mattress compatibility, and use the results as evidence for patterns—not as a self-diagnosis.