The Withings Sleep Analyzer is an ultra-thin under-mattress sensor that tracks sleep cycles, heart rate, and breathing rate without any contact on the body. It’s the world’s first non-invasive home device to deliver FDA-cleared sleep apnea detection alongside full sleep cycle analysis.
The device uses a pneumatic bladder sensor and embedded microphone to classify light, deep, and REM sleep stages automatically each night. Sleep apnea detection achieves 88% sensitivity against gold-standard polysomnography, with severity graded across four clinical levels. Heart rate tracks via ballistocardiography with accuracy matching wrist-based reference monitors. Snoring episodes log with timestamps and duration data synced to the free Health Mate app each morning.
Priced at $169.95, the Withings Sleep Analyzer qualifies for HSA/FSA reimbursement and generates physician-ready PDF reports for clinical use. This review covers setup, accuracy, features, user feedback, and whether the device is the right sleep tracker for you.
What Is the Withings Sleep Analyzer?
The Withings Sleep Analyzer is an ultra-thin under-mattress sensor pad that tracks sleep cycles, heart rate, breathing rate, snoring, and sleep apnea without any contact on the body. The pad slides silently under the mattress and connects to a wall outlet. Nothing touches the user throughout the night.
Here’s what makes it different. Withings describes it as the world’s first non-invasive home device to deliver medical-grade sleep apnea detection alongside full sleep cycle analysis. That combination of clinical function and consumer convenience sets it apart from basic wearable alternatives on the market today.
The form factor is deliberately minimal. A slim pad slides beneath the mattress, and a braided cable runs to a wall outlet. The pad fits mattresses measuring 4 to 15 inches (10 to 38 cm) thick. The pad covers most standard, memory foam, and hybrid mattresses used in homes.
How Does the Withings Sleep Analyzer Work?
The Withings Sleep Analyzer uses a pneumatic bladder sensor filled with air that detects pressure changes from body movements, breathing cycles, and heartbeats through the mattress surface. The bladder responds to micro-vibrations too subtle for standard motion sensors to capture reliably through layers of foam or coils.
In fact, it’s more sophisticated than it looks. Expert-created algorithms interpret the combined data from the pneumatic and sound sensors. Each period of the night is classified as light sleep, deep sleep, or REM based on changes in breathing rhythm, heart rate patterns, and movement intensity. The system also identifies full wake events even when the user does not leave the bed.
Here’s the privacy angle worth knowing: Wi-Fi disables automatically during sleeping hours to reduce electromagnetic activity near the user. Data is held in the device’s onboard storage and then syncs to the Health Mate app as soon as the user rises each morning.
Who Is the Withings Sleep Analyzer Designed For?
The Withings Sleep Analyzer is designed for adults who want detailed sleep data but find wristwatches, rings, or headbands uncomfortable to wear overnight. Users who’ve tried wearable sleep trackers and abandoned them due to discomfort represent the primary audience for this device.
And there’s a clinical use case too. The FDA-cleared detection algorithm generates data that physicians accept for diagnostic support. That gives users a credible way to document sleep apnea symptoms before scheduling a formal sleep study, which can cost thousands of dollars and require an overnight clinic stay.
To be clear, though: the device is not ideal for users who also want daytime step counting, workout logging, blood oxygen (SpO2) monitoring, or athletic recovery metrics. Those users gain more value from a smartwatch or fitness band that bundles sleep tracking with a broader health monitoring package.
What Features Does the Withings Sleep Analyzer Offer?
The Withings Sleep Analyzer tracks sleep cycle stages, generates an overall sleep score, monitors heart rate trends, logs snoring episodes, measures breathing rate, and creates physician-shareable PDF health reports. All of this data appears in the free Health Mate app without requiring a paid subscription to access the core metrics.
Bottom line: the sleep score system isn’t just one number. It breaks down total performance across six specific dimensions. Duration, time to fall asleep, sleep depth, interruptions, regularity, and ease of waking all contribute independently to the final score. Users can see exactly which dimension is dragging performance down rather than guessing at a single opaque number.
Core Features at a Glance:
- Sleep stage classification: light, deep, and REM sleep tracked nightly
- Sleep Score across six dimensions: duration, depth, interruptions, regularity, latency, wake time
- Heart rate monitoring via ballistocardiography throughout the night
- Sleep apnea detection with FDA 510(k) clearance and severity grading
- Snoring detection with timestamps and duration data per episode
- Physician-ready PDF reports via the free Health Mate app
The device also supports IFTTT integration through the Health Mate app. This connectivity lets users link their sleep schedule to smart home devices. A common setup triggers lights to dim and white noise machines to activate when the mat detects the user has settled into bed for the night.
Does the Withings Sleep Analyzer Detect Sleep Apnea?
Yes. The Withings Sleep Analyzer detects sleep apnea using a clinically validated algorithm that achieved 88% sensitivity and 88.6% specificity against gold-standard polysomnography for moderate-to-severe sleep apnea. These figures come from peer-reviewed validation studies that tested the device against accredited sleep lab results directly.
Here’s what that means in practice. The Withings Index grades detected sleep apnea severity across four distinct levels: Normal, Mild, Moderate, and Severe. Physicians use these classifications to assess whether the patient requires a formal sleep study, adjust treatment plans, or monitor changes in apnea severity over consecutive weeks of tracking.
Regulatory clearance backs up the clinical credibility. The device holds FDA 510(k) clearance in the United States for obstructive sleep apnea diagnostic support. European medical device certification also allows physicians in EU countries to use the measurements directly in a diagnostic context without ordering a separate sleep study first.
Sleep Apnea Severity Levels Detected:
- Normal: Fewer than 5 apnea events per hour of sleep
- Mild: 5 to 15 apnea events per hour of sleep
- Moderate: 15 to 30 apnea events per hour of sleep
- Severe: More than 30 apnea events per hour of sleep
Does the Withings Sleep Analyzer Track Heart Rate?
Yes. The Withings Sleep Analyzer tracks heart rate continuously throughout the night using ballistocardiography. The sensor measures micro-vibrations generated by the heartbeat through the mattress surface. This approach captures cardiac activity without any electrode contact or chest strap attachment required.
The good news? The Health Mate app reports the peak, lowest, and average heart rate for each individual night. Users can also view quarterly trend data showing how their resting sleep heart rate has changed over the past three months. Reviewers at Wareable confirmed that overnight heart rate data matched figures from medical-grade wrist-based reference devices in side-by-side testing.
Heart rate trend tracking adds a meaningful dimension beyond sleep monitoring alone. A steadily declining resting heart rate over weeks often signals improving cardiovascular fitness or reduced chronic stress. The Withings app surfaces this trend alongside contextual health guidance covering fitness, diet, and recovery factors that may be influencing the readings.
Does the Withings Sleep Analyzer Monitor Snoring?
Yes. The Withings Sleep Analyzer monitors snoring using an embedded microphone that records audio throughout the night, with algorithms distinguishing snoring from environmental sounds like traffic or a partner’s voice. The separation of snoring from ambient noise is handled entirely by onboard processing, so no manual audio review is required.
Think of it this way: the app doesn’t just tell you that you snored. The Health Mate app displays snoring episode data with timestamps, total snoring duration per night, and trend charts showing whether snoring frequency increases or decreases over weeks. Users can tap individual nights to see when snoring occurred relative to their sleep stage timeline.
And here’s the part most people miss: snoring data feeds directly into the sleep apnea detection pipeline. The Withings Index combines breathing interruption frequency with snoring patterns to classify apnea severity. Users who snore heavily but show no breathing interruptions receive a different clinical classification than those whose snoring accompanies clear apnea events.
How Do You Set Up the Withings Sleep Analyzer?
Setting up the Withings Sleep Analyzer involves sliding the slim mat under the mattress at chest height. The braided power cable plugs into a wall outlet. The device connects to home Wi-Fi through the Health Mate app on a smartphone. The entire process takes approximately 10 minutes from opening the box to the first active night of tracking.
The reason it’s so low-friction is simple: the one-time setup does not require recalibration once complete. The device calibrates automatically to the user’s body weight and mattress density during the first few nights. Recalibration is only needed if the mat is moved to a different bed or repositioned significantly on the same mattress.
Zero ongoing maintenance is required after the initial installation. The device tracks every night automatically. No charging is needed because the mat runs continuously from the wall outlet connection established during setup. It’s genuinely a set-it-and-forget-it device in daily practice.
What App Does the Withings Sleep Analyzer Use?
The Withings Sleep Analyzer uses the Withings Health Mate app, available free on iOS and Android, which displays nightly sleep scores, stage breakdowns, heart rate charts, snoring logs, and longitudinal trend data in a single dashboard. The app requires no additional purchase beyond the device hardware for access to core tracking features.
Here’s a feature worth knowing about. The Health Mate app generates downloadable PDF reports formatted specifically for physician review. Users bring these reports to medical appointments to provide clinically formatted sleep data that supports diagnosis discussions. The PDF includes nightly summaries, apnea event logs, and trend charts that physicians recognize from standard sleep study report formats.
An optional Withings+ subscription unlocks personalized coaching programs, enhanced health insights, and advanced analytics. But basic sleep tracking, score reporting, and PDF generation remain fully functional without it. Users who want guided sleep improvement programming will find the subscription adds real value. Those seeking data monitoring alone don’t need it at all.
Health Mate App Feature Comparison:
| Feature | Free Tier | Withings+ |
| Sleep Score & Stages | Yes | Yes |
| Heart Rate Charts | Yes | Yes |
| Snoring Logs | Yes | Yes |
| Physician PDF Reports | Yes | Yes |
| Personalized Coaching | No | Yes |
| Advanced Analytics | No | Yes |
How Accurate Is the Withings Sleep Analyzer?
The Withings Sleep Analyzer delivers strong accuracy for sleep stage tracking and heart rate monitoring, with reviewers from Tom’s Guide and Wareable confirming that core metrics consistently align with reference polysomnography results. The device performs reliably across multiple consecutive nights once calibration settles in during the first week of use.
Here’s the thing: there is one documented accuracy limitation to know about. Long lie-ins after an alarm are occasionally logged as additional sleep time rather than a wake period. This error inflates total reported sleep duration and can distort the sleep score by artificially extending what the algorithm interprets as the final sleep cycle of the night.
Clinical validation studies provide the most objective benchmark available. Testing against polysomnography confirmed 88% sensitivity and 88.6% specificity for moderate-to-severe sleep apnea detection. These figures place the device in the same accuracy tier as other FDA-cleared home sleep apnea screening tools currently on the market.
How Does the Withings Sleep Analyzer Measure Sleep Stages?
The Withings Sleep Analyzer measures sleep stages by feeding breathing rate, movement intensity, and heart rate variability data from the pneumatic sensor into proprietary algorithms that classify each night period as light, deep, or REM sleep. The multi-signal approach improves classification reliability compared to devices that rely on a single sensor type alone.
Deep sleep presents a specific physiological signature the sensor captures through the mattress. Reduced breathing rate, minimal body movement, and low heart rate variability are the primary signals detected during slow-wave sleep phases. The combination of all three signals reduces the chance of misclassifying light sleep as deep sleep in the final report.
REM sleep shows a distinct signal profile that the algorithm handles separately. REM is characterized by increased respiratory irregularity and specific micro-movement patterns that differ from light sleep signals. The algorithm uses this contrast to differentiate REM from lighter stages, The app displays the full nightly sleep architecture at a glance.
What Do Withings Sleep Analyzer Reviews Say?
Withings Sleep Analyzer reviews from expert outlets consistently recommend the device for non-wearable sleep tracking, with TechRadar, Tom’s Guide, and T3 all rating it positively; MedGrade awards it 94 out of 100 for clinical utility. The expert consensus centers on the device’s passive operation and clinically validated apnea detection as its strongest differentiators.
What’s more, reviewers consistently identify the zero-friction setup and automatic nightly operation as the most compelling features. The ability to generate detailed sleep data without touching the body is described across multiple reviews as a meaningful advantage over competing wearable sleep trackers that require overnight wearing and daily charging cycles.
The most recurring criticism across expert reviews targets the app’s coaching depth. Multiple reviewers note that the Health Mate app presents sleep data clearly but rarely provides specific, actionable guidance on what behavioral changes would improve a user’s scores. The device informs well but guides poorly without the optional Withings+ subscription.
What Are the Positive Reviews of the Withings Sleep Analyzer?
Positive Withings Sleep Analyzer reviews focus heavily on the comfort and convenience advantage over wearable alternatives. Wareable reviewers describe the experience as ‘zero impact on daily or nightly routines,’ with no straps, bands, or pressure points affecting sleep position or comfort throughout the night.
Tom’s Guide testers praised the detailed sleep score breakdown and longitudinal trend data as strong value-adds over basic wearable trackers. One tester recorded a two-beat-per-minute decrease in average sleep heart rate over a single quarter of tracking. That’s the kind of meaningful long-term health signal the device surfaces naturally over time without any extra effort from the user.
MedGrade highlights the HSA/FSA eligibility and physician-ready PDF export as features that truly set this device apart from consumer-grade sleep wearables. The ability to bring standardized sleep data to a doctor’s appointment without ordering a separate clinical sleep study is a practical clinical utility that reviewers consistently flag as underappreciated by most buyers.
What Complaints Do Withings Sleep Analyzer Users Have?
The most consistent user complaint targets the lie-in accuracy issue. Some users report that post-alarm time spent resting in bed is logged as additional sleep. This error inflates total sleep duration in the Health Mate app and skews weekly and monthly averages upward.
Users who purchased the device specifically for sleep improvement guidance report frustration with the coaching limitations. The Health Mate app surfaces sleep data effectively but provides minimal instruction on what behavioral changes would raise scores. This gap between data and actionable advice disappoints users who expected more than a passive monitoring experience from the free tier.
The single-user limitation creates a real-world restriction for couples. The device tracks only one person per mattress placement. It’s impossible for two partners sharing a bed to each receive independent nightly sleep data from a single unit. Two separate devices would be required for dual tracking in a shared sleeping environment.
How Does the Withings Sleep Analyzer Compare to Alternatives?
The Withings Sleep Analyzer costs $169.95 as a one-time purchase compared to the Oura Ring Gen 3 at $299 plus a $5.99/month subscription. The Withings mat is considerably more affordable for users focused exclusively on sleep data rather than all-day wellness tracking.
The comparison to Apple’s Beddit Sleep Monitor shows clear value in the clinical apnea feature. The Beddit costs $149 but does not include FDA-cleared sleep apnea screening. The Withings Sleep Analyzer adds that clinical-grade screening for a $20.95 price premium. For users with apnea concerns, that’s a strong value trade-off at a very modest price difference.
Wearable trackers like the Garmin Index Sleep Monitor offer daytime activity tracking that the Withings mat cannot replicate. Users who need step counts, workout metrics, and sleep data in one device will find a wearable tracker more efficient overall. The Withings Sleep Analyzer wins on comfort and clinical apnea accuracy but concedes on daytime activity feature breadth.
Competitor Comparison:
| Device | Price | Apnea Detection | Wearable | Subscription |
| Withings Sleep Analyzer | $169.95 | Yes (FDA-cleared) | No | Optional |
| Oura Ring Gen 3 | $299 + $5.99/mo | No | Yes | Required |
| Apple Beddit | $149 | No | No | No |
| Garmin Index Sleep Monitor | $129.99 | No | Yes | No |
Are There Any Side Effects of Using the Withings Sleep Analyzer?
No. The Withings Sleep Analyzer makes zero physical contact with the body. The under-mattress placement eliminates all risk of skin irritation, pressure sores, or allergic reactions that are documented side effects of overnight wearable sleep trackers. The under-mattress placement means the sensor never touches the user regardless of sleep position or nighttime movement.
Electromagnetic emission concerns are addressed directly by the automatic Wi-Fi shutdown feature. Wi-Fi disables when the device detects the user in bed and only reactivates when the user rises in the morning. Data is held in onboard storage overnight and transmitted only after the user is up and moving. That’s a meaningful design choice for users concerned about EMF exposure during sleep.
Two physical limits apply to sensor accuracy rather than user safety. The device requires the user to weigh under 350 lbs (159 kg) for the pneumatic sensor to generate reliable readings through the mattress. The mat must also be positioned beneath the user’s torso rather than legs or feet, since heart and respiratory signals are strongest at the chest-level placement point.
How Much Does the Withings Sleep Analyzer Cost?
The Withings Sleep Analyzer is priced at $169.95 (USD) in the United States and £119.95 (GBP) in the United Kingdom as a one-time device purchase with no mandatory ongoing subscription fees for core sleep tracking features. The hardware cost covers full access to sleep scoring, heart rate tracking, snoring logs, and apnea detection through the free Health Mate app.
Here’s a financial angle many buyers overlook. The device qualifies for HSA and FSA reimbursement in the United States. Users with qualifying health savings accounts can purchase the Withings Sleep Analyzer using pre-tax dollars, effectively reducing the out-of-pocket cost depending on their marginal tax rate. This benefit is not available with all competing sleep trackers at a similar price point.
An optional Withings+ membership adds personalized coaching and advanced analytics at an additional monthly cost. The majority of sleep tracking features remain fully accessible without a subscription. Users who want guided sleep improvement programming rather than raw data access will find the subscription meaningful; those seeking data monitoring alone don’t need it.
Is the Withings Sleep Analyzer Worth the Price?
Yes. The Withings Sleep Analyzer delivers strong value for users who want passive, non-wearable sleep tracking with clinical-grade sleep apnea detection, as the $169.95 price sits below comparable dedicated sleep monitors that lack the FDA-cleared apnea screening capability.
But it’s not the right pick for everyone. Users who also want daytime step tracking, workout logging, or SpO2 monitoring would receive more utility from a $200 smartwatch that bundles sleep tracking into a broader feature set. The Withings Sleep Analyzer earns its price specifically for its clinical depth and comfort advantage, not for comprehensive health tracking breadth.
Where Can You Buy the Withings Sleep Analyzer?
The Withings Sleep Analyzer is available on Withings.com and through major online retailers including Amazon, Best Buy, and B&H Photo in the United States, along with select European retailers authorized by Withings. Availability and certain clinical feature sets vary by region depending on applicable regulatory approval status.
Authorized Retailers:
- Withings.com (official store with full return policy)
- Amazon (verify US-certified listing before ordering)
- Best Buy (in-store and online availability)
- B&H Photo (online availability in the US)
Purchasing directly from Withings.com provides access to the brand’s return policy and ensures the device ships with the correct regional power adapter and applicable regulatory certifications for the buyer’s country. Third-party sellers on Amazon may ship international variants that differ in certified feature availability. Buyers in the US should confirm the listing ships a US-certified unit before ordering.
Is the Withings Sleep Analyzer Worth It?
Yes. The Withings Sleep Analyzer earns consistent expert recommendations for its passive operation, clinically validated sleep apnea detection, and detailed sleep metrics delivered without any overnight wearable contact required from the user. Every major review outlet testing the device rates it positively for core sleep tracking and apnea screening performance.
The device is best suited for adults who want medically credible sleep data, suspect they may have sleep apnea, or consistently find overnight wearables too uncomfortable to use night after night. The physician-ready PDF reports and HSA/FSA eligibility add practical clinical utility that generic consumer sleep wearables at comparable price points simply don’t provide.
Users who need daytime fitness tracking, blood oxygen readings, or independent sleep data for two people sharing a bed should look at a wearable tracker or a second dedicated device. But within the specific use case of passive, clinical-grade sleep monitoring, the Withings Sleep Analyzer delivers more capability per dollar than any direct alternative on the market today.