This is a measure of the oxygen in your blood, and large swings can be a sign of disorders like sleep apnea. The Sense is built with a tri-wavelength HR sensor on board and uses a relative SpO2 sensor to unlock Estimated Oxygen Variation while you sleep. (The Fitbit app shows sleep history, stage breakdowns, and detailed graphs) It uses the same tracking technology as the rest of the Fitbit line, but it also gives you the most complete experience when you're out of bed, which is why we have it as our top recommendation.įitbit Sleep Stages ensure that you can get a daily look at your light, deep, REM, and awake times, and you can still check in on how your night compares to the last month and other people your age. When it comes to tech, the Fitbit Sense 2 is the best wearable sleep tracker on the market right now, and we've tested it extensively. Fitbit Sense 2 The best sleep tracker overall It's estimated that 22 million Americans suffer from it, and the majority don't realize it.Ĭhoosing a sleep-tracking wearable with a SpO2 sensor will offer up this data, so you can ensure you're not an unwitting statistic. That might sound nuts, but the amount of oxygen in your blood – or at least a dip in levels while asleep – is linked to a condition called sleep apnea. You'll find them on some Fitbit, Garmin and Withings models, as well as devices like Whoop and Oura. The latest data in town is blood oxygen saturation – which is tracked using a SpO2 sensor. Several of the devices we've listed (Fitbit, Withings, and Xiaomi) offer a single sleep score from their data. Many brands now distill your data down into a meaningful number, so you can see how your slumber stacks up. Looking at all this data can feel overwhelming – and, when you've looked at the data for a few weeks, you'd be forgiven for wondering what it all means. If you're not cycling between them – or you're missing out on some of these stages altogether – it's a smoking gun for bad sleep, and a great place to start improving. You should cycle through these sleep stages a few times per night to feel rested – and the trackers in this guide will show this in their analysis. Sleep stages are tracked by most top sleep monitors, and this means logging the amounts of light, deep, and REM sleep plus any awake time – including tossing and turning. Older fitness trackers used wrist movement to track sleep, but now this is all combined with heart rate monitoring – and companies like Fitbit and Withings are looking at your beats per minute (bpm) during sleep to make assumptions about duration and sleep stages. The tech involved here is much more advanced than the smartphone apps that use the accelerometer to track movement under your pillow – and, as a result, things are much more accurate. Best sports watch for sleep tracking - Polar Pacer Proīefore you can pick the right sleep monitor to watch over your night, you need to know exactly what you want from one.Best hybrid smartwatch for sleep tracking - Withings ScanWatch.Best Apple Watch for sleep tracking - Apple Watch Series 8.Best sleep tracker for recovery insights - Whoop Strap 4.0.Best fitness tracker for sleep tracking - Fitbit Charge 5.Best smart ring for sleep tracking - Oura Ring 3.Best bedside sleep tracker - Google Nest Hub (2nd Gen). Best mattress sleep tracker - Withings Sleep.
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