Withings Sleep Mat

What Is the Withings Sleep Mat?

The Withings Sleep Tracking Mat is an under-mattress sensor pad that tracks sleep stages, heart rate, respiratory rate, and snoring without requiring you to wear anything to bed. It slides under your mattress (or between your mattress and topper) and uses pneumatic sensors to detect body movement and vital signs through the mattress surface.

Withings, a French digital health company with a strong track record in clinical-grade consumer devices, designed the Sleep Mat as a set-and-forget tracker for people who dislike wearing wrist bands or rings to bed.

How It Works

The mat contains an array of pneumatic sensors that detect pressure changes caused by breathing, heartbeats, and body movements. These signals are processed by an onboard chip and transmitted via Wi-Fi to the Withings Health Mate app. The algorithms classify sleep into light, deep, and REM stages, and calculate a nightly sleep score.

A 2021 clinical validation study demonstrated that the mat's sleep staging accuracy approaches that of clinical polysomnography for healthy adults, particularly for deep sleep and wake detection. The mat also integrates IFTTT, enabling automations like dimming smart lights when you get into bed.

Key Features

• Contactless tracking: No wearable needed—place the mat once and forget it
• Clinically validated: 2021 study comparing Sleep Mat accuracy to polysomnography showed strong agreement for deep sleep and wake detection
• Snoring detection: Identifies snoring episodes with duration and intensity metrics, useful for screening potential sleep apnea
• Smart home integration: IFTTT-compatible for automated bedroom routines
• Long-term trends: Health Mate app tracks weeks-to-months patterns in sleep quality, heart rate, and respiratory rate

Our Testing Experience

Setup was the simplest of any sleep tracker we have tested: slide the mat under the mattress, plug in the USB cable, connect to Wi-Fi, and you are done. There is literally nothing to charge, wear, or remember each night. This passive approach is the mat's greatest strength.

Sleep staging results were broadly consistent with our Oura Ring Gen4 readings, though the mat occasionally misclassified brief wake-ups as light sleep. Snoring data was a useful discovery—one tester who had not previously considered snoring an issue found they were logging 45+ minutes per night, prompting a follow-up with their doctor. The main limitation is that this is a tracking-only device: it does not regulate temperature, play sounds, or actively improve your sleep. It tells you what happened, but changing outcomes is up to you.

The Bottom Line

The Withings Sleep Mat is the best option for anyone who wants reliable sleep data without wearing anything to bed. At $129, it is a fraction of the cost of smart rings or watches, and its clinical validation gives the data real credibility. The tradeoff is that it is purely passive—it observes but does not intervene.