- Data seemed generally reliable in my testing
- Clean, easy-to-navigate app
- Detailed snoring and sleep apnea insights
- No wearable required
- I had some wake-up logging issues
- Sleep advice felt basic
If you’re looking to get a detailed picture of your sleep, Withings Sleep Analyzer may well catch your eye. This dedicated sleep sensor lies under your mattress, tracking what happens throughout the night.
In Europe, it’s been classified as a Class IIa medical device, with peer-reviewed clinical research supporting its ability to detect sleep apnea. It also provides a detailed look at what happens between getting into bed and waking up, from sleep stages and heart rate to snoring.
As we pay more attention to our overall wellness, good sleep is increasingly being put in the spotlight. And there’s no shortage of devices promising to analyze our nights. Sleep apnea, in particular, has become an increasingly important focus for wearable tech, with smartwatches and rings using combinations of sensors to look for signs of disrupted breathing during sleep.
So, is there still a reason to buy a dedicated sleep tracker like Withings Sleep Analyzer? We spent a month with the device to find out.
Design
Withings Sleep Analyzer itself is a pretty simple affair, and a tried-and-tested design that Withings has been using in various forms since Aura back in 2014.
It’s a slim, soft mat that slips between your mattress and bed base, positioned around chest level. From there, it keeps tabs on your movement, breathing, and heart rate using pneumatic and sound sensors.
The mat tracks one person at a time, so if you want to monitor the sleep patterns of two people sharing a bed, you’ll need two Sleep Analyzers.
At just 5mm thick, I found it so thin that there was no way I could notice it under the mattress. It also works with slatted beds, although Withings recommends placing a flat, sturdy surface to ensure full contact. I used the cardboard sleeve from the packaging for exactly this purpose.
Sleep Analyzer also has a long power cable, so positioning it shouldn’t be much of an issue. In my case, the nearest plug was on the other side of the bed, and the cable still reached without any problems.
Data collection
In terms of tracking and data collection, I think Withings Sleep Analyzer offers a pretty complete set of sleep stats, with the Withings app bringing everything together.
The key areas are sleep duration, sleep stages (deep, light, REM, and awake), Sleep Score, heart rate, and breathing-related data. You can also see how consistently you go to bed and wake up, while the app uses these to give you a broader view of your sleep habits.
I found there was plenty of information to dig through, although I sometimes questioned how accurately the device had identified certain sleep and wake periods. In one instance, I spent an hour longer in bed while awake, yet the tracker counted that time as sleep.
Then you get the extra stuff. Snoring is tracked using the built-in sound sensor, with the app showing the number and duration of snoring episodes. The sensor combines sound with respiratory patterns in hopes to distinguish your snoring from your partner’s. I can’t really verify how accurate that separation is, but I believe it worked reasonably well in my testing.
And finally, there's the main feature: sleep apnea. Sleep apnea is a condition that causes repeated interruptions or reduction in breathing during sleep, and it can go unnoticed for years.
That’s where Sleep Analyzer becomes more interesting than a basic sleep tracker. In Europe, it offers clinically validated sleep apnea detection. The system uses the signals picked up through the mattress to potentially identify breathing disturbances, while the sound sensor may provide additional information.
The results aren’t presented simply as a yes-or-no answer. Withings Sleep Analyzer may estimate the severity of sleep apnea, with results ranging from mild to severe, giving you a better idea of how frequently breathing disturbances occur during the night. That said, don’t treat this as a diagnosis—you should discuss your symptoms with a healthcare professional.
Accuracy
Reviewing sleep data is tricky because the real benchmark is a clinical sleep study. Withings has tested Sleep Analyzer against polysomnography (PSG), the gold standard for sleep diagnostics, with a peer-reviewed study finding good performance for detecting moderate-to-severe sleep apnea.
Sleep tracking
To get a second point of reference, I also tested Sleep Analyzer alongside my Fitbit Charge 4. And I have to say, there was plenty of overlap between the two during my testing, with both generally showing similar patterns for sleep duration and stages.
However, I did notice some issues with Sleep Analyzer’s sleep and wake detection. As I already mentioned, the device counted my long lie-in as REM sleep. This really made me more cautious about taking individual sleep-stage results too literally. So, the data may be more helpful for spotting patterns over time than relying on the numbers from any one night.
Heart rate
The heart rate was more reassuring for me. Sleep Analyzer measures cardiac activity through ballistocardiography, alongside respiratory rate and movement.
In my testing, its overnight heart-rate readings were broadly in line with Fitbit. Fitbit doesn’t provide an average heart rate for your sleep, but it does sample resting HR at night, and these were both logged within 2bpm.
Yet, I was slightly disappointed that Sleep Analyzer doesn’t collect overnight heart rate variability (HRV) data.
Sleep apnea and snoring
And then there’s sleep apnea and snoring—which is possibly the most compelling part of Sleep Analyzer. I had a few snoring events logged, although they were only fleeting flashes.
However, I did border on moderate sleep apnea, which then triggered a flag to take one of two surveys found in the app. I answered a series of yes/no questions, and it was determined that my likelihood of actually having obstructive sleep apnea was low. Of course, later I discussed this with my family doctor to be sure.
The app, analysis, and education
So far, so good—bar the squiffy wake-up data. I’ve always been a fan of the Withings app, and use it for weight tracking via the smart scales. It also brings together data from other devices and health platforms, so there’s more than just sleep data to look at.
I like the overview of each night’s sleep, and the graphs are clear and well structured. It’s also very easy to tap into different sections of your sleep to see when they occurred. There’s sleep history and trends as well.
But there’s a key part of the Withings app that disappointed me. It’s good at informing you which elements of your sleep weren’t up to scratch, but I found it less effective at helping me understand what I could actually do about them.
For example, I regularly found my Sleep Score was low. It would flag this as an issue, but the suggestions were basic and not particularly personalized when it came to improving it. You may get better guidance through the optional Withings+ subscription, but I didn’t get to try it this time, so I can’t comment on how much it changes the experience.
Ultimately, the app gives you plenty to look at, but I sometimes felt it left me with more data than practical answers.
Withings Sleep Analyzer vs. wearable sleep trackers
If you’re still unsure whether Withings Sleep Analyzer might suit you better than a sleep-tracking smartwatch or a ring, you may want to compare it with some popular options.
Oura Ring 5 is one of the best-known dedicated sleep and recovery trackers, making it a natural and comfortable alternative. Meanwhile, Withings ScanWatch 2 offers sleep tracking alongside broader, all-day wellness monitoring—a great option to consider if you want more than just a tracker for sleep.
Here’s a side-by-side comparison:
| Product | Withings Sleep Analyzer | Oura Ring 5 | Withings ScanWatch 2 |
| Type | Under-mattress sleep sensor | Smart ring | Hybrid smartwatch |
| Sleep data |
|
|
|
| Companion app | Withings app | Oura app | Withings app |
| Subscription | Optional | Yes | Optional |
| Battery life | Mains powered | Up to 9 days | Up to 35 days |
| Best for | Dedicated sleep tracking without wearing a device | In-depth wearable sleep tracking | All-day wellness tracking |
Other sleep tracker reviews
Best sleep trackers 2026: Tested and rated options from our reviews
Oura Ring 5 vs. Oura Ring 4: Key difference compared
Oura Ring 5 review: The new gold standard
Who should—or shouldn't—buy Withings Sleep Analyzer?
In the end, the decision is yours to make, yet I have to admit I enjoyed using Withings Sleep Analyzer.
Wearing a smartwatch or ring every night can get tiring, not to mention having to charge it and potentially lose a night of sleep data. With Sleep Analyzer, there was none of that. Once it was set up, it was easy to forget it even existed.
Consider Withings Sleep Analyzer if you:
- Want detailed sleep data without wearing a device
- Are particularly interested in sleep apnea and snoring detection
- Prefer a dedicated sleep tracker that works automatically
Skip Sleep Analyzer if you:
- Want highly personalized sleep coaching
- Prefer a wearable that tracts more than sleep
- Want advanced recovery and wellness insights
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