Colin Snow
Fitbit devices have a robust sleep-tracking function that can help you get better rest, boost energy, and improve your well-being. They can track your sleep patterns, sleep stages, and sleep scores. The sleep tracking functions are available on the basic Fitbit app, while some features, like a sleep profile that assigns you an animal-like avatar, are only on Fitbit Premium. The sleep tracking functions work in the same way and deliver the same information across all Fitbit devices. The device automatically detects your sleep when you wear it to bed and tracks your sleep through your movement and heart rate patterns.
| Characteristics | Values |
|---|---|
| How does Fitbit track sleep? | Fitbit uses movement and heart-rate patterns to estimate sleep cycles. |
| How does it work? | When the body is completely at rest and hasn't moved for about an hour, the device records that the user is asleep. |
| How is sleep duration calculated? | Sleep duration is calculated by subtracting time spent awake and restless from the overall tracked sleep time. |
| How does it track sleep stages? | Fitbit estimates sleep stages by tracking beat-to-beat changes in heart rate, also known as heart rate variability (HRV). |
| How does it help with sleep patterns? | Fitbit provides a monthly personalized analysis of 10 key metrics to help users improve their sleep habits and quality. |
| How does it help with sleep disorders? | Fitbit's sleep stages data helps users track their patterns and notice variations. This data can be shared with a doctor for further analysis. |
| How accurate is it? | Fitbit's sleep tracker is considered accurate by many users, but it is recommended to use it for more than one night to learn about the user's body. |
| How is it different from lab sleep tracking? | Sleep stages are traditionally measured in a lab using an electroencephalogram to detect brain activity. Fitbit provides a more comfortable and convenient way to estimate sleep stages. |
| What are the different modes? | Fitbit offers a normal mode and a sensitive mode for sleep tracking. Normal mode records significant movements like rolling over as time spent awake, while sensitive mode records nearly all movements as time spent restless or awake. |
| How to set up sleep tracking? | Users can set up sleep tracking through the Fitbit app by adjusting their sleep goal and target bedtime. |
| What are the requirements for sleep tracking? | Fitbit devices should be worn during sleep, with a snug fit on the wrist, to automatically record sleep data. |
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What You'll Learn
How to set up sleep tracking on a Fitbit
To set up sleep tracking on a Fitbit, you must wear your device during sleep. Wrist-based Fitbit devices and Google Pixel Watch series automatically detect your sleep when you wear your device to bed. It is recommended to wear your device in a snug wristband during sleep. Do not wear your device in a clip or pendant accessory. When your body is completely at rest and you haven't moved for about an hour, your device records that you're asleep.
To set up sleep tracking, you can use the Fitbit app. From the Today tab, tap the Sleep duration tile. Tap the menu icon at the top right, then Settings. Tap Bedtime, Wake Time, or Sleep duration to set or edit your targets. You can also set a bedtime reminder in the Fitbit app to help you maintain a consistent sleep schedule. When it's time to wind down for bed, you'll receive a notification on your phone.
If you have a Fitbit device with heart-rate tracking, you can find a record of the sleep stages you cycle through. Sleep stages are traditionally measured in a lab using an electroencephalogram to detect brain activity, along with other systems to monitor eye and muscle activity. Your Fitbit device can estimate your sleep stages in a more comfortable and convenient way. Fitbit estimates your sleep stages by using your movement and heart-rate patterns.
If you have a Fitbit Sense or Fitbit Versa 3, you can turn on the snore and noise detection feature to allow the microphone on your device to track noise, including snoring from you or someone next to you. When you wake up, you'll find a summary of your nightly results in a report.
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How accurate are Fitbit sleep trackers?
Fitbit sleep trackers have gained popularity as a way to monitor sleep. They provide information about the quality and duration of sleep, which can help users make informed decisions about their sleep habits. However, the question of their accuracy has been a subject of debate.
The accuracy of Fitbit sleep trackers has been the focus of numerous studies, with researchers comparing the results of Fitbits to those of polysomnography, a highly accurate method of sleep measurement. These studies have found that Fitbit sleep trackers tend to overestimate total sleep time by approximately 10% and underestimate deep sleep and REM sleep by about 20% each. This means that the Fitbit may indicate that your sleep is worse than it actually is, as deep sleep and REM sleep are crucial for recovery and memory consolidation.
Fitbits use motion tracking, heart rate monitoring, and machine learning to estimate sleep duration and quality. They detect movement during sleep using accelerometers, with the assumption that less movement indicates deeper sleep. Additionally, they monitor heart rate patterns and beat-to-beat changes to identify sleep stages. However, heart rate can vary significantly during sleep, and Fitbits may struggle to accurately identify sleep stages solely based on heart rate data.
When compared to professional scientific encephalography (EEG), Fitbits are found to be around 72-73% accurate. This accuracy level is comparable to other sleep trackers on the market, such as Apple Watches, Garmin watches, and Oura rings. While almost all of these devices can passably estimate total sleep time (80-90% accuracy), they are less precise in identifying specific sleep stages (50-65% accuracy).
In conclusion, while Fitbit sleep trackers provide valuable insights into sleep patterns and can help users understand their sleep habits, they may not always deliver perfectly accurate results. Their accuracy depends on various factors, including movement, heart rate, and the device's ability to interpret the data. It is important to consider the limitations of Fitbit sleep tracking and consult a healthcare professional for any sleep-related concerns.
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How does a Fitbit track sleep?
Fitbit devices can track your sleep by using movement and heart-rate patterns. When your body is completely at rest and you haven't moved for about an hour, your Fitbit records that you're asleep. Additional data, such as the length of time when your movements indicate sleep behaviour (like rolling over), help confirm your sleep status.
While you sleep, your Fitbit device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages. When you sync your device in the morning, it uses your movement and heart rate patterns to estimate your sleep cycles from the previous night.
Fitbit devices that track heart rate (except Charge HR and Surge) also track sleep stages. Sleep stages are traditionally measured in a lab using an electroencephalogram to detect brain activity, along with other systems to monitor eye and muscle activity. Your Fitbit device can estimate your sleep stages in a more comfortable and convenient way.
The overall sleep score is a sum of your individual scores using three components: sleep duration, sleep quality, and restoration, for a total score of up to 100. In the restoration component, you can check the estimated oxygen variation graph each day. Blood oxygen saturation normally fluctuates, but high variations in the estimated blood oxygen saturation levels can indicate that a person had variations or disturbances in breathing during sleep.
To get the best sleep tracking results, wear your Fitbit moderately snugly and higher on your wrist (toward your elbow) for the most accurate readings.
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How does a Fitbit's sleep tracking work with a Premium account?
Fitbit's sleep-tracking feature, Premium Sleep Profile, provides a detailed monthly analysis of 10 features to help users understand their sleep quality and quantity. The monthly analysis is based on the sleep data collected by the Fitbit device, which includes the number of hours spent in each sleep stage, weekly average minutes asleep, and sleep patterns. The device automatically detects sleep when it is worn to bed and the user's body is completely at rest without any movement for about an hour. It then records the time spent awake, restless, and asleep.
The Premium Sleep Profile feature also includes snore and noise detection, which uses the microphone on the Fitbit Sense or Versa 3 to track noise, including snoring from the user or someone sleeping nearby. This feature does not save any audio recordings and only uses the microphone to register noise levels and snores. The nightly results are summarized in a report that can be accessed when the user wakes up.
In addition to the monthly analysis and snore and noise detection, the Premium Sleep Profile also offers a personalized Sleep Score. This score is based on the user's sleeping heart rate, movement, and time spent in each sleep stage. The sleep stages include light sleep, deep sleep, and REM sleep, which are estimated by the Fitbit device using the user's movement and heart-rate patterns. The device tracks the beat-to-beat changes in the user's heart rate, known as heart rate variability (HRV), which fluctuate as the user transitions between different sleep stages.
The Premium Sleep Profile also provides a comprehensive understanding of the user's sleep style with an animal match, known as the Sleep Profile animal. Overall, the Fitbit Premium Sleep Profile offers a range of features and insights to help users track and improve their sleep habits and quality.
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How does Fitbit sleep tracking compare to lab-based sleep tracking?
Sleep stages are traditionally measured in a lab using an electroencephalogram to detect brain activity, along with other systems to monitor eye and muscle activity. Fitbit devices, on the other hand, estimate sleep stages by using movement and heart-rate patterns. When the device doesn't detect any movement for about an hour, it assumes that you're asleep. Additional data, such as the length of time of movements that are indicative of sleep behaviour (like rolling over), can also help confirm that you're asleep.
Fitbit devices track the beat-to-beat changes in your heart rate, known as heart rate variability (HRV). These numbers fluctuate as you transition between light sleep, deep sleep, and REM sleep stages. When you sync your device in the morning, it uses movement and heart rate patterns to estimate sleep cycles from the previous night.
Fitbit's sleep feature also allows you to set a sleep schedule. You can set either a bedtime or a wake-up time target, or set both targets. If you meet your target when you go to sleep or wake up within 30 minutes of the target, a star appears in the sleep schedule graph.
Fitbit also provides a Sleep Score, which is a quick way to gauge your sleep. It is based on heart rate, the time spent awake or restless, and sleep stages. The overall sleep score is a sum of your individual scores using three components: sleep duration, sleep quality, and restoration, for a total score of up to 100.
It is important to note that the Fitbit sleep feature is not intended to diagnose or treat any medical condition and should not be relied on for any medical purposes. If you have any concerns about your health, it is recommended to consult a healthcare professional.
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Frequently asked questions
Fitbit devices automatically detect your sleep when you wear your device to bed. It is recommended to wear the device in a snug wristband during sleep. The device records that you are asleep when your body is completely at rest and hasn't moved for about an hour.
Fitbit devices track your sleep by monitoring your movement and heart-rate patterns. The device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages.
The Fitbit sleep tracker is considered to be fairly accurate by many users. However, it is recommended to use the device for more than one night to get a better understanding of your sleep patterns and allow the device to learn about your body.
