
Fitbit offers a range of fitness trackers and smartwatches that can help you track your sleep. The Fitbit Charge 5, for instance, has been used by many users to track their sleep. While some users have complained about the accuracy of the sleep tracking, others have found it useful for monitoring their sleep stages and setting smart alarms. The device uses movement, heart rate, and breathing patterns to infer which sleep stage you are in, and can differentiate between light sleep, deep sleep, and REM sleep. To track your sleep, simply wear your Fitbit Charge to bed, ensuring it is snugly and higher on your wrist for the most accurate readings. You can then view your sleep data, including sleep scores and sleep stages, on the Fitbit app.
| Characteristics | Values |
|---|---|
| How to track sleep | Wear the Fitbit device during sleep |
| How to check sleep data | Check the Fitbit app or the device |
| How does it work | Uses movement, heart rate patterns, and HRV to estimate sleep cycles |
| Sleep profile | Available on the 1st of every month with a Fitbit Premium subscription |
| Snore and noise detection | Available on Fitbit Sense or Fitbit Versa 3 |
| Smart alarm | Available on Fitbit Charge 5 |
| Battery life | Up to 7 days |
| Sleep tracking accuracy | May vary depending on factors like how the tracker is worn |
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What You'll Learn

Fitbit Charge 5 and 6 track sleep
The Fitbit Charge 5 and 6 are both capable of tracking sleep. All Fitbit devices can track sleep in terms of duration, and newer devices with heart rate monitors can also track the differences between sleep stages, such as light sleep, deep sleep, and REM sleep. The sleep staging data is less important than the overall amount of sleep, but it can still be useful for gaining deeper insights into your sleeping habits.
To track your sleep using a Fitbit Charge 5 or 6, simply wear the device to bed. The Fitbit will automatically start logging your sleep once it recognizes that your body is going into sleep mode. It is recommended to wear the device moderately snugly and higher on your wrist for the most accurate readings. If you have a Fitbit Premium subscription, you can also take advantage of additional sleep tracking features, such as the Sleep Profile and Sleep Animal profile.
To view your sleep data, you can sync your Fitbit each morning and check your sleep stats in the Fitbit app or on your Fitbit device. The data will include your sleep score, hours slept, and sleep schedule. You can also set a sleep schedule in the app to help you achieve your sleep goals and establish a consistent routine.
The Fitbit Charge 5 and 6 have been reported to provide useful insights into sleep patterns, with some users finding that their sleep follows a similar rhythm each night. However, it's important to note that factors like how the tracker is worn or how you're sleeping can affect the accuracy of the data. Additionally, the accuracy of sleep staging data can vary between nights, with an overall accuracy of around 70-80% compared to EEG measurements.
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Heart rate tracking
To track your sleep using a Fitbit, you simply need to wear the device to bed. Fitbit uses movement and heart-rate patterns to estimate your sleep cycles. When you don't move for about an hour, your tracker assumes you're asleep. While you sleep, your device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuates as you transition between sleep stages.
Fitbit devices with heart-rate tracking capabilities can identify the different sleep stages you cycle through. While you're asleep, your body typically goes through several sleep cycles that last on average 90 minutes. Each cycle alternates between two types of sleep: light sleep and deep sleep. Periods of deep sleep are usually longer earlier in the night, with REM sleep periods becoming longer as the night goes on. REM sleep is the stage associated with vivid dreams.
The Fitbit Charge 5, for example, can track your heart rate during sleep. However, it's important to note that the accuracy of sleep staging data may be affected by factors such as how the tracker is worn or individual sleep patterns.
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Sleep stages
Sleep experts recognize three main sleep stages:
- Light Sleep: This is the stage where your body unwinds and slows down as you enter sleep. It is characterized by less brain activity than REM sleep and serves as the transition between being awake and falling asleep.
- Deep Sleep: This is a period of restorative sleep for both the mind and body. It typically lasts longer earlier in the night and is associated with slower brain activity.
- Rapid Eye Movement (REM) Sleep: This is the stage where most dreaming occurs, often associated with vivid dreams. REM sleep periods tend to get longer as the night progresses.
Fitbit's sleep tracking feature uses movement and heart-rate patterns to estimate your sleep stages. When you haven't moved for about an hour, your Fitbit assumes you're asleep. It also tracks beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between different sleep stages.
To access detailed sleep stage data, you may need a Fitbit Premium subscription. Additionally, sleep stages require at least 3 hours of sleep data, so they won't be available for shorter naps.
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Snore and noise detection
The snore and noise detection feature is available on the Fitbit Sense, Versa 3, and Fitbit Charge 5. This feature allows the microphone on your Fitbit to track noise while you sleep. By analyzing noise information every few seconds, your device can track the overall noise level of your surroundings and check for snoring throughout the night.
To enable snore and noise detection on your Fitbit, open the Fitbit app and visit the Sleep page. On the sleep page, you’ll see a "Check for snoring" option. If you click on "Learn more," you will be taken to a page that tells you about the snore and noise detection feature. If you click next, then agree and continue to the privacy policies, you will then be able to enable the watch to record your noise levels at night.
You can also go to your Fitbit’s Settings app > Vibration & audio settings and turn the microphone on. Once you turn on snore detection, charge your Fitbit to at least 40% before going to bed, and then wear your Fitbit while sleeping. Your Fitbit then tracks snoring and other noises throughout your sleep cycle.
It is important to note that this feature impacts your device’s battery life, so it is recommended to charge your device to at least 40% before going to bed. Your device won’t be able to identify whether snoring comes from you, someone sleeping nearby, or even a pet. Additionally, this feature is not intended to diagnose or treat any medical condition and should not be relied upon for any medical purposes.
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Fitbit Premium subscription
To track your sleep with a Fitbit Charge, all you need to do is wear it to bed. The device will automatically detect when you've fallen asleep and start tracking your sleep. Fitbit estimates your sleep stages by using your movement and heart-rate patterns. It will detect when you haven't moved for about an hour and assume you're asleep. It also tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuates as you transition between light sleep, deep sleep, and REM sleep stages.
Fitbit Premium is a fitness subscription service that offers additional features and insights on top of the standard Fitbit functionality. Here are some key points about Fitbit Premium:
- Subscription Options: Fitbit Premium offers both monthly and yearly subscription options. The yearly subscription is priced at $79.99, while the monthly subscription costs $9.99 per month.
- Sleep Tracking: Fitbit Premium provides more detailed sleep tracking features. The Sleep Profile feature gives you a monthly detailed breakdown of your sleep, including 10 monthly metrics and a sleep animal characterizing your long-term sleep behaviours. It also includes the Snore & Noise detection feature, which uses the microphone on your Fitbit to track noise and snoring during sleep.
- Personalized Insights: Fitbit Premium offers personalized insights and guidance based on your health and fitness data. It provides customized tips and observations to help you reach your goals and live a healthier life.
- Workouts and Mindfulness: Fitbit Premium gives you access to a library of workouts, mindfulness sessions, and healthy recipes. These sessions are led by expert trainers and partner brands, offering guidance in various areas such as stress management and sleep improvement.
- Compatibility: Fitbit Premium is compatible with most smartphones and tablets. It requires a Google Account, the Fitbit mobile app, and a compatible Android or iOS device.
- Trial and Cancellation: Fitbit Premium offers a trial period for new users, after which you can choose a subscription plan. You can cancel your subscription at any time, but it's important to know where you purchased your subscription to manage the cancellation process effectively.
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Frequently asked questions
All you need to do is wear your Fitbit Charge to bed. The device will automatically start logging your sleep once it recognises that your body is going into sleep mode.
The Fitbit Charge tracks your sleep in terms of how long it lasts. It also tracks your sleep pattern, including the time spent awake, restless, and asleep. If your device tracks your heart rate, it can also track the differences between sleep stages, such as light sleep, deep sleep, and REM sleep.
You can access your sleep data by syncing your Fitbit Charge with the Fitbit app each morning. You can then check your sleep data, such as your sleep score, on the app.

















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