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We've taken a ton of sleep trackers to bed: Here's our top 7

Quit counting sheep and get better sleep with one of the top devices for bedtime tracking.
By
September 2, 2022
Fitbit Sense
By Fitbit
7
Check price
Positives
High-end, premium design
Improved quick-release straps
Accurate GPS and heart rate sensors
Detailed sleep tracking
~6-day battery life
Negatives
Bad inductive button
EDA sensor needs refining
Fitbit OS still needs work
Fitbit Versa 3
By Fitbit
9
Check price
Positives
Decent battery life
Pretty accurate health tracking
Built-in GPS
Negatives
Tiny app library
Onboard music limited to two services
Proprietary charging cable
Withings ScanWatch
By Withings
9
Check price
Positives
Premium, classy design
Long-lasting battery
Easy-to-use ECG monitor
AFib and breathing disturbance notifications
Fantastic sleep tracking
Negatives
Small display limits smart features
Few advanced fitness features or insights
Fitbit Inspire 2
By Fitbit
7
Check price
Positives
Good value
Small, lightweight design
Accurate fitness, health, and sleep tracking
Connected GPS is a nice addition
Negatives
Bland design
The display isn’t great
Side buttons can be unresponsive
Withings Sleep
By Withings
Check price
Positives
Detailed stats
Sleep apnea tracking
Hands off sleep tracking
Negatives
not accurate for naps
Syncing can be slow
Kokoon Nightbuds
By Kokoon
Check price
Positives
Slim and comfortable
Can play music while you sleep
Negatives
Sleep tracking is a little basic
Case doesn't charge buds

Getting a good night’s sleep is one of the most important factors in staying healthy (and happy). If you’re feeling tired lately, or don’t feel like you’re getting enough shut-eye, a sleep tracker might be exactly what you need. We’ve rounded up the best sleep trackers available, including watches, earbuds, and a non-wearable.


The Fitbit Sense and Versa 3 are the best sleep trackers available

Fitbit Sense
Fitbit Sense
High-end, premium design • Improved quick-release straps • Accurate GPS and heart rate sensors • Detailed sleep tracking • ~6-day battery life
The Fitbit Sense delivers on the basics, but it's clear some features need more work.
The Fitbit Sense is Fitbit's flagship health-focused smartwatch. It has built-in ECG, GPS, and heart rate sensors, plus a new EDA Scan app that measures your body's stress levels. This is by far Fitbit's most advanced health watch so far.
$180.00 at Amazon
Save $119.95
Fitbit Versa 3
Fitbit Versa 3
Decent battery life • Pretty accurate health tracking • Built-in GPS
The Fitbit Versa 3 is a watered-down version of the Fitbit Sense.
If you're looking for the best all-around smartwatch at a pretty good price, you're likely looking for the Fitbit Versa 3. Fitbit's cheaper flagship smartwatch sports standalone GPS, an accurate heart rate sensor, and plenty of nice smartwatch features.

Many Fitbit devices nail sleep tracking. The Sense and Versa 3 are no exception. In fact, they’re two of the best sleep trackers you can currently buy. Before we dive in, let’s cover the difference between each option. The Fitbit Sense is currently the cream of the crop as the absolute best smartwatch Fitbit offers. It features advanced health tools, including an ECG and EDA sensor. The Fitbit Versa 3 is a simplified version of the Sense, dropping those sensors in favor of a lower price tag. Since the average person doesn’t necessarily need such detailed health tracking, we typically consider the Versa 3 the best value option for most shoppers.

The Fitbit Sense and Versa 3 are great devices for different users but offer identical sleep tracking experiences that are hard to beat.

Regardless of which watch you choose, Fitbit offers a very thorough and accurate sleep tracking experience. Both the Fitbit Sense and Versa 3 will track your total time asleep and awake, as well as your sleep stages. They also provide a sleep score from 1 to 100. When reviewing both devices, we found their sleep tracking to be very reliable and often received sleep scores that aligned with how rested we felt. The watches even provide details on sleeping heart rate and estimated oxygen variation. We compared these values to other tools we wore to bed and were impressed by Fitbit’s accuracy.

Sleep data is displayed clearly and concisely in the Fitbit app where you can view separate graphs of your time asleep and awake, sleep stages, and restoration. As it does with all health and fitness tracking data, Fitbit does a great job organizing sleep data and presenting results in a manner that is easy to understand. This is especially true for Fitbit Premium members thanks to Fitbit’s new Sleep Profile.

Sleep Profile is Fitbit’s latest program which involves monitoring your sleep for an entire month. Fitbit then analyzes this long-term data to determine your sleep phenotype — one of six types of sleep habits. Each month, you will find your phenotype in the Fitbit app as well as information about your sleep habits that resulted in that selection. For fun, Fitbit represents each of the phenotypes as animals: the Bear, Dolphin, Giraffe, Hedgehog, Parrot, and Tortoise. Again, this program echoes Fitbit’s commitment to offering accessible data analysis and actionable insights.

Read more: The best Fitbit trackers you can buy

When you’re ready to face the day, both of these Fitbit smartwatches are great activity trackers with enough smartwatch features to keep you connected. Tap into more than 20 sport modes or make a phone call with on-wrist phone call support. We found both watches comfortable on the wrist with plenty of battery life.

Fitbit has recently announced a new generation of its smartwatches, the Fitbit Sense 2 and Versa 4. These are slated to become available sometime “this fall.” Though we’re excited about some of the upgrades heading to each of these lineups, (namely Google Maps and Google Wallet), we’ll have to put each through its paces. Our guess is that we’ll have two new best sleep trackers on our hands.

What makes them stand out

  • Most reliable sleep data: Fitbit offers the most reliable sleep tracking we’ve gotten our hands on. In fact, we often use these devices to test the performance of other brands when reviewing new wearables.
  • Scientific insights: Fitbit analyzes a frankly unprecedented amount of data and filters it all down to digestible insights you can actually act on. The new Sleep Profile program is revolutionizing our understanding of sleep hygiene and helping users build better habits.
  • Strength and value: Both the Fitbit Sense and Versa 3 are powerful devices we rank among the best smartwatches you can buy. We applaud the added health features of the Sense, and also appreciate the pared-down Versa 3 at a lower price tag.
  • It’s a Fitbit: Particularly for those new to tracking, Fitbit offers a well-rounded and approachable ecosystem, including one of the best companion apps available.
  • Smartwatch smarts: Once the sun comes up, these devices continue to deliver useful tools right to your wrist, from voice assistant and phone call support to built-in GPS.

Best of the rest: 5 other sleep trackers worthy of your consideration

Fitbit’s newest smartwatches are our top picks for the best sleep trackers you can get, but there are tons of others available. These six devices are also great options for overnight tracking.

  • Withings Scanwatch: The best tracker for detecting sleep apnea, the Withings Scanwatch is one of the only wearables that can monitor for signs of the condition.
  • Fitbit Inspire 2: For users interested in the Fitbit ecosystem but seeking a smaller form factor, the Inspire 2 is the best choice.
  • Garmin Venu 2 Plus: The Venu 2 Plus is the best sleep tracker from Garmin. It offers sleep score functionality powered by Garmin-owned Firstbeat.
  • Withings Sleep: The best non-wearable sleep tracker is the Withings Sleep. Place it under your mattress and forget about it till morning.
  • Kokoon Nightbuds: A wearable option for somewhere other than your wrist, Kokoon Nightbuds help you fall asleep to your favorite calming audio and monitor your rest overnight.

The Withings Scanwatch is the best for sleep apnea detection

Withings ScanWatch
Withings ScanWatch
Premium, classy design • Long-lasting battery • Health Mate app is well-designed and easy to use • Potentially lifesaving and easy-to-use ECG monitor • Clinically validated AFib and breathing disturbance notifications • Fantastic sleep tracking
Don't overlook the ScanWatch as a "specialty" hybrid smartwatch.
The new Withings ScanWatch is taking health tracking to the next level. It has built-in ECG and SpO2 sensors to help detect early signs of AFib and sleep apnea. Plus, it acts as a hybrid smartwatch, giving you notifications, HR data, and more on your wrist.

Now available in the US, the Withings Scanwatch is one of the most detailed and accurate sleep trackers we’ve used. On top of recording your sleep duration, depth, regularity, and interruptions, it uses a medical-grade SpO2 monitor to detect breathing disturbances overnight. The Scanwatch performs a Respiratory Scan, which measures your heart rate, heart rate variability, respiratory rate, and oxygen saturation levels.

One downside to the Scanwatch’s sleep tracking is that it does not monitor your sleep stages. Withings said it’s keeping that functionality exclusive to its sleep mat (below). However, if you’re looking for a wearable with a timeless aesthetic and powerful sleep tracking, the Withings Scanwatch is a good pick. It’s one of our favorite wearables we’ve reviewed in the last few years.

For starters, this is a gorgeous watch. Hybrid devices are the perfect way to tap into smartwatch smarts without broadcasting that you’re tracking data. The Withings Scanwatch utilizes such a small display it’s easy to pass off as a traditional timepiece. Meanwhile, the window is the perfect size to get key stats at a glance when you want them. However, we would have loved to see the display just a tad brighter.

See also: The best hybrid smartwatches

With a stainless steel case and a sapphire glass display, the Withings Scanwatch not only looks great, but it’s also quite durable. We didn’t attempt to smash it, but we didn’t have to worry about cracks or scratches while exercising. It comes in two sizes, 38mm and 42mm, so there is likely a good fit for most wrists. It was, however, slightly heavier than we expected, though the weight just took some getting used to and wasn’t noticeable after a few days, even on long runs.

We know because we took the Scanwatch on a series of runs to test out its heart rate sensor. If you are looking for a workout companion, the accuracy will likely be good enough for most people. The device’s companion app, Health Mate, can also send data to a number of third-party fitness platforms, including Google Fit, Strava, and RunKeeper.

Where this watch might fall short for shoppers is its smartwatch features. Like most hybrids, the Scanwatch lacks the well-rounded experience you’ll find on full-blown smartphone companions like the Apple Watch or the Fitbit options above. If you are looking for something with contactless payment support or onboard music, for example, you may want to stick to those options.

What makes it stand out

  • Medically validated: The Scanwatch boasts clinically validated health sensors and offers potentially life-saving AFib and breathing disturbance notifications.
  • Easy on the eyes: A classy device featuring premium build materials, this versatile watch fits in at the bar and in a boardroom.
  • Subdued smarts: The Scanwatch is the perfect device for anyone who wants to track their health without strapping on a sporty smartwatch.

The Inspire 2 is the best affordable sleep tracker from Fitbit

Fitbit Inspire 2
Fitbit Inspire 2
Good value • Small, lightweight design • Accurate fitness, health, and sleep tracking • Connected GPS is a nice addition
Fitbit is really banking on the free Premium membership with the Inspire 2.
Make healthy a habit with Fitbit Inspire 2 and a free 1-year Fitbit Premium trial for new Premium users. This slim, easy-to-use fitness tracker packs 24/7 heart rate, Active Zone Minutes, activity and sleep tracking, 10 days of battery and more—and paired with step-by-step fitness & nutrition programs, personalized insights, and sleep tools from Premium, you have all you need for a healthier you.
$62.90 at Amazon
Save $37.05
$66.55 at Amazon
Save $33.40

This will eventually get old to hear, but Fitbit puts out the best sleep trackers available. If you want a device with a small form factor and stellar sleep tracking, Fitbit’s Inspire 2 is a great buy. Like its far more expensive siblings above, the Inspire 2 tracks your total time asleep as well as your stages (light, deep, REM). It will also record any intervals you spent awake throughout the night.

The Inspire 2 then uses these data sets and your sleeping heart rate to provide a sleep score. We found the Inspire 2’s scores very accurate compared to our perceived exhaustion in the morning. A score of ~60 correlated with groggy mornings, while a well-rested feeling usually aligned with scores in the 80s. Compared to other fitness trackers at this price point, the Fitbit Inspire 2 provides fantastic, reliable sleep data. It’s also just a strong wearable with plenty else to offer.

Don’t miss: The best fitness trackers you can buy

For working out, we love the device’s more than 20 exercise modes plus SmartTrack automatic activity recognition. GPS is not built-in on the Inspire 2, so you’ll have to carry your phone on runs and rides. The device also offers 24-hour heart rate monitoring as well as heart rate zone heat maps of all your tracked routes. During testing, we loved analyzing our patterns of exertion on our favorite running routes using those heat maps.

The Inspire 2 isn’t, however, Fitbit’s best available fitness tracker. Right now, that title belongs to the Fitbit Charge 5 which provides more smart features, built-in GPS, and an overall better design. The Inspire 2 is much more affordable, though, at about $50 less. If budget is a concern, the Inspire 2 is a good value.

Fitbit also recently announced the Inspire 3, though it won’t be available until sometime later this fall. Currently available for preorder at the same $99 launch price as the Inspire 2, the newest generation offers a full-color touchscreen display and SpO2 monitoring.

What makes it stand out

  • Affordability: Catching Zs shouldn’t break the bank. This option from Fitbit costs well under $100 but offers fantastic data.
  • Small impressions, big results: If a bulky watch keeps you up at night, this slim tracker might be a helpful option. It’s extremely lightweight and comfortable without sacrificing sensors or accuracy.
  • Fitbit is simply the bestThe biggest strength of the Inspire 2 is its brand name. For the most detailed tracking in the game, Fitbit is the play.

The Garmin Venu 2 Plus is the best sleep tracker from Garmin

Garmin Venu 2 Plus
Garmin Venu 2 Plus
Excellent design and build quality • Features rapid charging technology • Accurate fitness and health tracking • Excellent phone call support
Garmin is trudging into true smartwatch territory with the Venu 2 Plus.
The Garmin Venu 2 was nearly crowned our favorite wearable of 2021. Its accurate fitness- and health-tracking features, as well as the company’s revamped software, made for an overall compelling package. But Garmin watches tend to fall far behind the competition when it comes to “smart” features. You can install third-party apps and watch faces, but there’s traditionally been no support for voice assistants, phone calls, or other smartwatch staples.

If you’re deep in the Garmin ecosystem, you’ll want to pick up a Garmin Venu 2 Plus for sleep tracking. Like the Venu 2, it offers Garmin’s sleep score feature, powered by Firstbeat. Garmin’s sleep score, coupled with the company’s Body Battery feature, allows you to dig into your energy levels and determine how well-rested you actually are each morning. This can be especially helpful for athletes who need to decide what type of training to plan for the day. Body Battery remains one of our favorite Garmin features, and has proved itself useful throughout Garmin reviews. We’ve consistently found the values match up with our perceived energy and help guide healthy workout choices.

The Venu 2 Plus can also measure your sleep duration, stages, and total time awake. We were happy to find these values aligned with our Fitbit Sense during testing. The Garmin watch also tracks blood oxygen levels, respiration rates, and overnight movements. These values were pretty accurate compared to other devices but what we really love is the deep well of extrapolated insights you’ll find each morning in the Garmin Connect app. Not only does the app provide a breakdown of your sleep quality, but it also offers tips on how to improve your daily habits and bedtime routine.

Don’t miss: The best Garmin watch you can buy

Beyond the bed, the Venu 2 Plus is a more well-rounded device than ever, which is why it’s our top pick from Garmin. To start, the Venu line is the company’s smartwatch for the masses. We value its excellent build and incredible GPS accuracy and, during testing, were unsurprised to find highly accurate health and fitness tracking on board as well. It even offers smart features like Garmin Pay support and music storage.

However, to make this generation stand apart, Garmin added voice assistant support as well as support for on-wrist phone calls. For us, this makes the device an incredibly balanced tool for all-day wear and the best smartwatch Garmin has to offer. Sure, battery life could be improved, but rapid charging alleviates the issue slightly. Plus, it still blows the 18-hour Apple Watch Series 7 out of the water.

What makes it stand out

  • Garmin Connect is dense with data: Garmin’s companion app offers more insight and data analysis than most of the competition. For a truly deep look at your shut-eye, Garmin delivers.
  • It makes Garmin accessible: Unlike Garmin’s Fenix 7 or Instinct 2 lineups, the Venu 2 Plus is an approachable, well-rounded device that won’t overload users with too many niche features.
  • Great by day and by night: This device isn’t just a good bedmate, it’s also a well-rounded smartwatch and a very accurate fitness tracker.

The Withings Sleep is the best nonwearable sleep tracker

Withings Sleep
Withings Sleep
Best non wearable sleep tracker • Can detect signs of sleep apnea • Compatible with Alexa
The easiest way to track your sleep and improve your health
The Withings Sleep is a smart sleep-tracking mat that you place under your mattress to analyze your nights— no need to put on a wearable before bed. It tracks your sleep quality, heart rate, and can even track your snoring. It displays the results directly on your smartphone and can identify health disorders such as sleep apnea. In addition, the app comes with insights and suggestions to improve your sleep and to have a more productive day.

If you want a specialized sleep tracking device that you don’t have to put on your wrist or finger, look no further than Withings Sleep (formerly Nokia Sleep). This smart pad can be placed under your mattress to track your sleeping patterns without sacrificing comfort. While you must be specific when setting it up the first time, you only have to do so once. After you install the mat you don’t have to touch it again. It’s also quite thin, so don’t worry about feeling anything below you while you sleep.

The Withings Sleep collects your data throughout the night, basing your sleep stages on your body movement. The pad tracks all the basics: sleep duration in each phase, interruptions, and heart rate. It also offers some extras you won’t find on a wearable sleep tracker. The Withings Sleep has a built-in microphone that can help detect breathing disturbances and identify signs of chronic conditions such as sleep apnea.

In the morning, Withings displays all of your data in Health Mate, the same companion app mentioned above utilized by the Withings Scanwatch. Compatible with both iOS and Android phones, Health Mate is very easy to use and provides plenty of detailed information, including a sleep score. It even offers tips on how to improve your sleeping habits. If you have any concerns about your sleep quality, you can export your data as a PDF to share with your healthcare provider.

However, one of the best things about Withings Sleep is that it’s a smart home gadget. It’s compatible with Alexa and other smart home products, allowing you to set up routines that foster a healthy sleep environment. These include scheduling bedtime indicators such as turning the lights off or adjusting the thermostat when you go to bed.

Between the one-time setup and the automatically generated “sleep diary” for sharing data with your doctor, the Withings Sleep is the best no-fuss sleep tracker. For shoppers who want to track sleep but don’t want to fiddle with a wearable, this is the best buy on our list.

What makes it stand out

  • Nothing to wear: Slip into pajamas and hit the hay — this device doesn’t require strapping anything to your wrist or anywhere else.
  • Set it and forget it: The Withings Sleep doesn’t require you to change your routine in the slightest. Tracking occurs automatically.
  • Extra smarts: A healthy sleep environment is key to quality sleep. The Withings Sleep links up with other devices in your home to automate perfect bedtime conditions.

Kokoon Nightbuds are the best earbuds for sleep tracking

Kokoon Nightbuds
Kokoon Nightbuds
Dynamic noise masking technology • Auto fades-off the audio • Comfortable fit
A new sensing headphone to get a better sleep
The Kokoon Nightbuds’s latest intelligence technology uses dynamic noise masking to block noise and disturbances. It displays the user's preferred audio, and auto fades-off when falling asleep. In addition, Kokoon Nightbuds’ sensing headphones track your sleeping patterns with their in-ear heartbeat captors to produce a daily report about the quality and the length of your sleep. These new sleep-tracking headphones are accompanied with an app in your device to display the right sound to give the user a new sleeping experience.

If wrist wear isn’t for you but you’re still open to wearables in general, we recommend trying out Kokoon Nightbuds (and we mean trying out, as the company offers a 30-day trial!). These earbuds feature built-in sensors that collect information about your sleep and sleep quality. Using infrared light, they measure your heart rate and its variability and analyze the data to determine your sleep efficiency, length, and quality. In addition, they play first- and third-party audio content and provide sound masking.

As far as fit, Kokoon Nightbuds are designed to be the most comfortable earbuds you own. They’re made from extra soft silicone and, at 5.4mm, are considerably slimmer than the average Bluetooth earbud. They also ship with alternative ear tips so you can specify the fit to your ear shape. They’re an ideal headset for sleepers of all kinds, even side sleepers.

Most complaints from reviewers boil down to a few shortcomings. The first is that sleep tracking data is limited. When you review your stats in Kokoon’s app, you won’t find nearly as much detailed information as you would in the Fitbit app, for example. A big-picture look at your habits and sleep quality can’t necessarily be gained from this device. However, that might be fine if you are only looking for the basics and a general view of your sleep each night.

Related: The best wireless earbuds

The second complaint frequently mentioned is that there isn’t an extensive library of audio content available through the app. You will find a selection of ambient sounds and storyscapes, but not an endless supply. Luckily, you can now also listen to your own third-party content, so this isn’t as much of an issue as it sounds.  Plug into your own personal wind-down tunes or Spotify library and the buds will fade out the sound as they detect you falling asleep. Not only that, but the audio will automatically switch to your preference of white, brown, or pink noise.

While Kokoon Nightbuds don’t offer any smartwatch or fitness tracking features, they’re still useful even after you wake up. Use your earbuds as a regular Bluetooth headset for watching TV, listening to music, or making phone calls. The buds don’t charge in their case like many popular brands, though, so don’t forget to plug in between uses.

What makes them stand out

  • Play it by earRather than a bracelet, these buds plug into your ears for an audio experience that will help you fall asleep and stay there.
  • Tune in to better sleep: Kokoon Nightbuds offer first-party content ranging from soundscapes to white noise, or you can sync up with popular apps to listen to your own content.
  • Keep it simple: This pick focuses on delivering very basic sleep data for anyone who just wants broad strokes.

What to look for in a good sleep tracker

These days we track everything from steps and calories to cycles and SpO2. Tracking sleep is one more way you can gain insight into how your body is functioning and how you can improve your health and performance. But where to start? Tracking Zs comes down to finding the right device for you. In addition to your budget, consider the factors below to find out which is the best sleep tracker for you.

  • Device type: Sleep trackers come in all different shapes and sizes — from familiar devices like smartwatches and fitness trackers to nightstand gadgets and bed pads. If you already track your daily activity on a favorite wearable, keep things streamlined by tapping into its overnight features. If wearing a sleep tracking watch to bed sounds uncomfortable, look for something you can tuck away or leave on your nightstand.
  • Data collected: Most sleep-tracking devices track movement and heart rate in addition to sleep stages (light, deep, REM) and time spent awake. However, some just collect the basics for users who only need broad-stroke data. How much information your device collects will determine what you can learn. Do you want to know how long you are sleeping or how well you are sleeping?
  • Additional features: Finally, think outside the box (bed?). Many devices offer plenty of additional features worth considering that go beyond tracking your rest. Do you want a watch that also tracks activity and other health metrics? What about support for a voice assistant? Our pick for the best non-wearable sleep tracker lets you set up a bedtime routine, including room temperature. Determine what extras will help you optimize your shuteye.

Why you should trust us & how we test

Android Authority has a long history with wearable devices, spanning back at least as far as the Pebble in 2013. Since then, we’ve reviewed hundreds of wearables and learned a lot along the way. Our team of dedicated health and fitness experts tests dozens of new wearables and fitness trackers every year. Only the very best make it onto recommendation lists like the one you are reading. How do we determine what’s worthy? When testing, we have two main focuses in mind: user experience and accuracy. To that end, we start by utilizing the device as a daily driver:

  • We wear the product 24/7, (except for charging time), to evaluate its day-to-day performance, capabilities, and comfort.
  • We note everything from strap materials and display brightness to navigation and battery life.
  • We tap into as many features as possible, leaving no stone unturned.
  • We set alarms, chat with voice assistants, fire off texts, follow breathing exercises, sweat through workouts, and much more.
  • We test sleep tracking accuracy and wear the watch to bed, comparing its data to other products well-regarded for their sleep analysis.
  • We test SpO2 sensors against other wearables or a pulse oximeter.
  • For heart rate monitoring, we equip chest straps to test the device’s accuracy and push the sensor through interval training workouts.
  • We also test GPS accuracy on outdoor runs and rides wearing the device, along with a notably accurate GPS device, to see how the review unit performs.
  • When possible, we strap on a comparable device from the current market to analyze how the review subject stands up to the similarly-priced competition.
  • We dig into the companion app. We look to see how the data is organized and analyzed and evaluate the ease of use.

As you can see, we don’t mess around! There is a ton of variety in smartwatches and trackers, and reviewing each product is quite nuanced. A Garmin Fenix 7 review looks a lot different from a Xiaomi Mi Band review, for example. So, we also determine the wearable’s place in the market in terms of form factor, target audience, and budget. Then, we check to see if the device is missing anything important that users might expect to see. Finally, we verify that it lives up to its brand’s (measurable) claims.

You can trust that our experts put every device through its paces. Typically, our review period lasts about a week. However, we sometimes extend it to weeks or months for especially feature-packed devices. We also revisit watches and trackers regularly to ensure they still hold up over time.


FAQs

Depending on your goals, it is safe to say that sleep trackers do “work.” They can absolutely help you gain insight that will allow you to improve your sleep habits.

The devices in this list provide accurate basic data, such as total time asleep. However, consumer sleep trackers can only make educated guesses about your sleep stages as they are not medical devices. The most accurate sleep stage data requires the measurement of brain waves.

Fitbit’s Versa 3, Sense, Versa 4, and Sense 2 offer snore detection, and snoring can sometimes indicate an underlying sleep condition, like sleep apnea. However, Fitbit smartwatches should not be used as a substitute for a medical professional.