Two minutes of review
The Withings Sleep Analyzer is a thin mat that slides under your mattress and records changes in pressure and noise throughout the night. The calibration is a one-time process. Once set up and connected to your phone and Wi-Fi network, your sleep patterns will be recorded every night without further input.
It’s a great choice if you have a fitness tracker on your wrist at night or want something that you can easily set and forget.
You will get slightly more detailed results than with a sleep-based sleep tracker (mainly due to the sound detection). The results are easy to review in the morning and appear to be consistent with those from wrist-based fitness trackers. We wouldn’t rely on the estimated wake-up time, although this may be the least important data point as you can check it for yourself when you wake up.
It’s easiest to use when your bed has a solid frame (like a divan). If you have a slatted frame, you will need to place the mat on something sturdy over the slats.
Price and availability
The Withings Sleep Analyzer is available now and costs $ 99.95 / £ 119.95 (approximately AU $ 145). It can be bought directly from Withings, but is also available from Amazon.
Sleep apnea detection wasn’t available at launch (likely due to the need for FDA approval) but was added via a software update in 2019.
The Withings Sleep Analyzer is a narrow, gray mat that you place under your mattress at the same height as your chest and connect to your phone via Bluetooth using the Withings Health Mate app.
The sleep analyzer does not contain a battery, which is understandable as the heat generated can create a fire risk due to the lack of air circulation under a mattress. However, this limits the possible uses. Although the cord is quite long (about ten feet), you’ll need an outlet fairly close to your bed to keep it plugged in overnight.
The way it works is interesting and very different from sleep-based sleep monitors. Most of the data is captured by its pneumatic sensor, which identifies and separates different types of movement. For example, it can differentiate between changes in pressure caused by your heart rate, breathing, and tossing around during the night.
The device also contains sound sensors that can suppress snoring and separate it from other sounds like outdoor traffic, your washing machine’s spin cycle, and your partner’s snoring.
Setup and use
Calibrating the device is a bit time consuming, but only needs to be done once. Place the mat under your mattress at chest level (keep it on the side of the bed if you’re sharing it with a partner), plug it in, install the Withings Health Mate app (available for Android and iOS ) and connect to the mat via bluetooth.
If you don’t already have a Health Mate account, you’ll need to create one that requires your name, email address, password, and your current height and weight. You also need to connect the Sleep Analyzer to your home WiFi network. Make sure you have your password ready when you set up.
This is the same app used by other Withings devices, including fitness trackers and smart scales, so you can manage them all from one place.
Once this is done, it will take a few minutes to configure the mat. During this time, you may hear some purring noises under your mattress, but that’s nothing to worry about. Do not sit on your bed while this is happening. The app will inform you when the process is complete.
Once that’s done, just go to bed as usual and your sleep stats will appear in the app as soon as you get up in the morning. Remember, you have to leave the mat tucked in.
When you get up you will get a number of statistics about your sleep. You won’t always have time to fully process these. So it is good to see that you are initially presented with an overall rating. A more detailed analysis is available if you choose to do further analysis.
You will receive an overall sleep rating, which is then broken down into duration, sleep time, depth, time to get up, interruptions and regularity (measured over a period of several nights). This is more detailed than the data you get from a Fitbit device, which only assesses the duration, quality (time in deep and REM sleep), and recovery (a combination of sleep heart rate and restlessness) of your sleep.
Tapping on each of these ratings will bring up a graph showing the data recorded by the sleep analyzer during the night. This will be accompanied by advice on how to improve this aspect of your sleep (e.g., go to bed earlier and maintain more regular sleep patterns).
The pattern of light, deep, and REM sleep represented what we would expect from a typical 90 minute sleep cycle. The resting heart rate matched the data from our Fitbit Charge 4 that we were still sleeping when we were definitely awake and had a cup of tea. This could be because we have a fairly low resting heart rate when we are awake (around 52 beats per minute).
It’s worth noting that while snoring is often an indicator of sleep apnea, the condition can also be silent. So if you feel unusually tired even after a good night’s sleep, it is always advisable to see a doctor.
Buy it when
You hate wearing a watch at night
The Withings Sleep Analyzer fits under your mattress, and once the initial set-up is complete, it’s almost impossible to forget about it. You will not feel it at all in your sleep and will only be able to see the power cord.
You want to improve the quality of your sleep
The Sleep Analyzer gives you a detailed breakdown of your night’s sleep each morning, including tips on how to improve over time (even if you can’t directly control them).
Don’t buy it, though
There is no electrical outlet near your bed
The Withings Sleep Analyzer does not have a battery (for safety reasons) and must therefore be connected to an electrical outlet. Likewise, if your electrical outlets are already occupied with a phone charger and a machine or lamp with white noise, you cannot use it.
You are satisfied with the results of your watch
The Withings Sleep Analyzer doesn’t provide much more data than you get from your fitness tracker and is probably not enough to justify the cost if you’re already happy with the data from your existing wearable.
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