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The Withings Sleep Analyzer tracks sleep from a powered mat beneath your mattress, so you do not have to wear a watch or ring overnight. It reports sleep timing, stages, heart-rate and snoring information in the Withings app. Its appeal is convenience; the main caveats are bed compatibility, occasional sleep/wake misclassification, and the fact that apnea detection is a region-specific feature—not a diagnosis.
What the Withings Sleep Analyzer tracks
The Sleep Analyzer is a powered sensor that sits under the mattress and sends data to the Withings app over Wi-Fi after setup with a compatible smartphone. Withings lists sleep duration, sleep onset and wake time, deep/light/REM stages, interruptions, heart rate, snoring duration and a Sleep Score. The product guide distinguishes these general sleep-tracking measures from the Sleep Apnea Detector, which is separate software.
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Withings’ UK product page says online data storage is free and unlimited with a Withings account, with data stored locally between syncs. That statement does not establish broader retention, privacy or deletion terms. Check the current product listing for your country for app and phone compatibility requirements, which can change.
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For apnea measurement, Withings instructs users to put the sensor sideways under the mattress at chest or heart level, with contact against both the mattress and the bed base. It should cover the sleeper’s usual position. On slatted beds, a flat, sturdy surface such as cardboard can provide support. The unit needs power; Withings advises waiting 10 minutes after connecting it before getting into bed. Its support article says to sleep at least five hours to receive apnea results the next morning. Follow the current instructions for your exact model and region.
#1 Best Overall
- EXPLORE THE DEPTHS OF YOUR SLEEP PATTERN - Sleep is the ultra-powerful sleep monitor that allows you to detect snoring, analyze your sleep, proactively monitor your heart rate and much more.
- WORLD PREMIERE - Sleep is the world's first under-mattress sleep sensor, with revolutionary features.
- LEADS TO MORE RESTFUL SLEEP - By analyzing the phases, depth and interruptions of your sleep, you can learn more about your nights and receive advice on how to improve your sleep.
- SNORING DETECTION - Sleep can automatically detect any snoring episodes, which can lead to sleep disturbances.
- ANALYZE YOUR CARDIOVASCULAR HEALTH - Every time your heart beats, it propels a mechanical wave through your body, systematically measured with great precision by the pneumatic sensor.
Withings’ product guide says not to use the sensor with waterbeds, air beds or mechanically articulated mattresses. It also cautions against interpreting recordings when someone other than the main user lies on the mat. For the apnea detector specifically, the guide lists arrhythmia, cardiac insufficiency, asthma and COPD as conditions that exclude use. Do not change treatment or medication based on a reading; consult a doctor.
Apnea detection depends on your region and model
Withings says Sleep and Sleep Analyzer are distinct products. Its support FAQ describes apnea detection as an additional Sleep Analyzer feature; the product guide identifies the Sleep Apnea Detector software as a medical device for non-US regions. This does not establish that the same feature or regulatory status applies in every country, or that a US-market device has equivalent access. Confirm the exact model and availability with the regional product page and instructions before relying on the feature.
Rank #2
- 【Non-Wearable Sleep Tracking for Better Rest】SOMNDEEP sleep monitor device uses 60GHz millimeter-wave radar to help track sleep routines contactlessly and quietly. With no skin contact and no tight wearables, it offers a gentle, comfortable option for adults, seniors, users with sensitive skin, a wide range of body types, and anyone who wants to understand sleep habits without disrupting natural rest.
- 【Plug In Once, Track Every Night】 Unlike wearable sleep trackers that require charging, wearing, or bedtime pairing, SOMNDEEP contactless sleep tracker is designed for simple plug-in use and automatic nightly tracking. It helps reduce missed data caused by forgotten wearables, low battery, or uncomfortable devices, giving you a more effortless way to follow your sleep routine.
- 【Complete Sleep & Wellness Insights】 Review sleep duration, body movement, restlessness, breathing pattern trends, heart rate, and sleep stage insights such as deep, light, and REM sleep. Compare daily reports and long-term trends to better understand your sleep patterns, adjust your daily routine, build better sleep habits, and support a healthier lifestyle over time.
- 【No Camera Radar Sensing for Privacy】 SOMNDEEP sleep tracker device uses radar-based sensing instead of a bedroom camera, so it does not record images or video. The private, contactless design helps capture sleep-related movement and routine trends while keeping your bedroom experience discreet, quiet, and comfortable.
- 【Easy App Reports & Clear Sleep Trends】 Sleep reports are automatically uploaded to the app via stable 2.4GHz Wi-Fi and shown in simple, easy-to-read charts. View daily sleep data, compare long-term trends, and understand changes in your sleep quality without complicated setup, making it easy for seniors and users who are not very tech-savvy.
Withings’ guide states: “Interpretations made by this software are potential findings, not a complete diagnosis of neither sleep apnea, nor other sleep breathing disorders.” The guide also says not to take clinical action based on detector output without a qualified health professional. If a result suggests apnea—or you have symptoms that concern you—discuss it with a clinician, who can determine whether further evaluation is appropriate.
How accurate and useful are the readings?
Independent reviews point to a useful but imperfect tracker rather than a substitute for clinical measurement. Wareable tested the device for a month and praised its wearable-free setup, generally reliable data in that reviewer’s experience, clear app organization and detail on snoring and apnea. The reviewer also described wake-time errors, including an hour awake in bed being counted as sleep, and found the coaching basic and not very personalized. Tom’s Guide’s 2026 roundup likewise praised the low-maintenance automatic start and stop, while noting that sitting in bed during the day can be mistaken for a nap.
Rank #3
- 【Non-Wearable, 100% Comfortable】Monitor your sleep with a smart sleep monitor—no wearables or cameras required. Powered by safe millimeter-wave radar technology, it’s perfect for anyone who prefers a comfortable, non-wearable experience. Enjoy private, comfortable monitoring with no physical contact and no visual recording.
- 【Complete Sleep & Wellness Tracking】Track your heart rate, breathing patterns and body movements in real time with this bedside sleep monitor. Accurately measure the percentage of deep, light, and REM sleep. Compare daily data and monitor long-term trends to see how your sleep quality changes. Stay updated on your sleep patterns for a better understanding of your overall wellness.
- 【See How Daily Activities Impact Your Sleep Quality】Our non-contact sleep tracker lets you observe how daily activities may affect your sleep cycles. Use daily in-app notes to log daily routines for long-term trend tracking of your sleep patterns. This data is for personal reference only.
- 【Gentle Reminders for Better Daily Routine】Set routine and supplement reminders or record personalized voice messages with your smart sleep monitor. Ideal for caregivers, families, or anyone who needs a little extra help staying on top of important tasks.
- 【Clear, Actionable Reports】View easy-to-understand reports about your sleep quality with the sleep monitor. Track long-term trends, better understand your daily habits, and receive helpful lifestyle suggestions to support better sleep quality and a more consistent routine. (Not for medical use.)
Those are reviewers’ observations, not controlled accuracy estimates for all sleepers, mattresses or conditions. Withings says the product has been compared with polysomnography, but the product-page material available here does not provide study details sufficient to quantify performance. Treat daily numbers as estimates and trends, and use them as prompts for discussion rather than proof of a medical condition.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who should choose an under-mattress tracker?
The Analyzer makes most sense if you want sleep data without wearing or charging a device at night, have a compatible mattress and bed base, and can place the powered mat near an outlet. It is dedicated to overnight tracking. A ring or watch is a better fit when you also want daytime activity or broader all-day biometrics, and you are comfortable wearing and charging it. Compare the specific device’s metrics, app, subscription requirements and regional medical features before deciding; these form factors do not provide clinically interchangeable results.
Quick Recap
Best Value
- NO WATCH, NO RING, NO CAMERA: OZI Sleep slides under your sheet to track overnight sleep patterns without a watch, ring, wristband or camera in the room. Just sleep normally and let OZI do the tracking
- TRACK THE SLEEP DATA THAT EXPLAINS YOUR NIGHT: View sleep stages, heart rate, breathing rate, movement, awake moments, sleep duration, time to fall asleep and your nightly Sleep Score in the OZI app
- REAL-TIME ALERTS FOR FAMILIES AND CAREGIVERS: Receive notifications for bed exits, unusual movement or changes in heart rate and breathing patterns, helping you stay informed without constant room checks
- EASY SETUP WITH NO MONTHLY SUBSCRIPTION: Place the sensor under the sheet, connect the app and start tracking in minutes. No monthly fees, no cameras and no wearable device to charge
- BUILT FOR ADULTS, KIDS 5+, COUPLES AND HOUSEHOLDS: Use OZI for your own sleep, a child, a partner, an older parent or anyone who wants better sleep visibility without wearing a watch or ring
Rank #4
- 【Real-time body movement change monitoring】Record every tiny movement change, and can monitor the number of times you leave the bed, the length of time you fall asleep, and the number of times you turn over.
- 【Sleep quality monitoring and management】Through various indicators and comprehensive intelligent AI algorithm analysis, it provides sleep state analysis, such as deep sleep, light sleep, and awake state.
- 【Sleep reporting and analysis】The intelligent sleep analysis report can intuitively display sleep parameters and provide effective sleep suggestions.
- 【Heart rate variation analysis】Heart rate variability can be analyzed through heart rate monitoring throughout the night, so as to have a deeper understanding of their physical recovery status and stress index, quantify sleep indicators, and improve physical and mental health.
- 【Sleep report】Sleep quality monitoring and management Through the comprehensive intelligent analysis of various indicators such as breathing, heart rate and body movement, it provides analysis of sleep states such as deep sleep, light sleep, REM and awake state
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 at the time of purchase will apply.
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