Herbie Murray
Fitbit devices are widely used for tracking sleep patterns and quality. While the devices are known for their sleep-tracking abilities, some users have reported issues with missing sleep data and inaccurate sleep scores. This has happened in the past, and there are several recommended steps users can take to address these issues, such as restarting the device, adjusting the band, and updating the app. Fitbit has also released updates to improve sleep tracking, resulting in more precise measurements of sleep stages and brief awakenings.
| Characteristics | Values |
|---|---|
| Fitbit sleep tracking issues | Missing sleep scores, Inaccurate sleep tracking, Inaccurate HR measurement, Inaccurate sleep stage tracking |
| Fixes | Restart device, Delete and re-enter sleep data, Wear device on inside of wrist, Wear device higher on arm, Wear device snugly, Wear device during sleep, Update device software, Check device sync, Reset device |
| Fitbit sleep tracking features | Sleep score, Sleep stages, Sleep schedule, Hours slept, Sleeping heart rate, Sleep profile |
| Fitbit sleep tracking devices | Charge 2, Charge 3, Charge 4, Charge 5, Versa 2, Versa 3, Sense, Sense 2, Inspire 2, Inspire 3, Luxe, Pixel Watch series |
| Fitbit sleep tracking improvements | Snore and noise detection, Two-factor authentication, Improved sleep stage tracking algorithm |
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What You'll Learn
Fitbit sleep score bug
On June 28, 2021, several Fitbit owners reported a missing sleep score for the previous night (Sunday into Monday). This issue seemed to be more widespread than previous instances, with a long thread of Sense, Versa 2/3, and Charge 4 users reporting the same problem. Fitbit acknowledged the issue, stating that it had been resolved.
To address the missing sleep score, Fitbit provided a temporary solution. Users were instructed to restart their Fitbit devices and then delete the previous night's sleep data from the Fitbit app. They could then manually re-enter the start and stop times for their sleep, which would generate a sleep score and stages.
While this particular incident was resolved, it highlights the occasional challenges faced by Fitbit users in accurately tracking their sleep. Some users have shared their experiences with inconsistent sleep tracking, where their Fitbit devices fail to record sleep data despite wearing them during sleep. In some cases, the issue may be related to the positioning of the device on the wrist, the tightness of the band, or the accuracy of heart rate tracking.
It is worth noting that Fitbit has continuously worked to improve its sleep tracking capabilities. In August 2025, Fitbit rolled out an update to its sleep stage tracking algorithm, aiming to provide a more precise measurement of sleep, especially during brief awakenings. This update resulted in more honest sleep reports, which may have initially shown slightly worse numbers for users.
Overall, while Fitbit sleep tracking has faced some challenges and improvements, it remains a valuable tool for many users to understand their sleep patterns and quality.
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Fitbit sleep tracking tips
Fitbit devices with heart-rate tracking can record the 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, and REM sleep periods are longer towards the end of the night.
To track your sleep with a Fitbit, wear your device in a snug wristband during sleep. Make sure the band is secure but not too tight, and wear it higher on your wrist, about 2-3 finger widths above the wrist bone. Do not wear your device in a clip or pendant accessory. Your Fitbit will automatically detect your sleep when you haven't moved for about an hour.
If you're missing sleep data, try manually syncing your Fitbit device again. You can also try shifting the Fitbit higher on your arm or wearing it on the inside of your wrist. If you still experience issues, check your sleep setting and change it from Sensitive to Normal.
To check your sleep stats, open the Fitbit app and tap the Sleep duration tile on the Today tab. You can view your sleeping heart rate and sleep stages for the desired week, month, or year. You can also set a sleep goal by tapping on the round icon at the top left of the screen.
With a Premium subscription, you can access additional features such as a sleep profile and snore and noise detection. The sleep profile provides a detailed sleep breakdown that is available on the first of every month. The snore and noise detection feature allows your Fitbit to track noise, including snoring from you or someone next to you.
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Fitbit sleep tracking issues
One possible explanation for missing sleep data is the positioning of the device. Fitbits are designed to be worn on the wrist, with the band attached snugly to ensure the tracker stays close to the pulse points. If the device is worn in a clip or pendant accessory, it may not accurately track sleep. Additionally, tattoos or sleeves on the wrist can interfere with sleep tracking, and some users have found that switching the device to the inner wrist or the opposite arm improves tracking.
Another factor that can impact sleep tracking is the tightness of the band. Some users have reported that tightening the band improves sleep tracking, while others have found that wearing it loosely works better. It is recommended to wear the device snugly, but not too tight, to ensure comfort during sleep.
In some cases, the issue may lie with the device itself. Fitbit devices use various sensors to compile sleep data, and if one of these sensors is not functioning properly, it can affect the overall sleep tracking. Additionally, Fitbit has acknowledged issues with sleep scores in the past, with some users experiencing missing sleep scores for a night. The company has usually resolved these issues within a day, as the underlying data is still collected.
To improve sleep tracking, Fitbit has also introduced updates to its sleep stage tracking algorithm. These updates aim to provide a more precise measurement of sleep, particularly when it comes to brief awakenings that may have been ignored by the previous algorithm. As a result, users may notice increased wake times and shifts in their sleep stage breakdowns, leading to slightly worse numbers but more accurate data.
It is important to note that sleep trackers are not perfect, and there may be times when data is missed or inaccurately recorded. Users can try different troubleshooting methods, such as adjusting the band tightness and position, forcing a sync, or restarting the device, to improve sleep tracking on their Fitbits. Additionally, keeping the Fitbit app up to date can fix a lot of issues.
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Fitbit sleep tracking accuracy
Fitbit sleep tracking technology has gained immense popularity as a way to monitor sleep. It provides information regarding the quality and duration of your sleep, helping you make informed decisions about your sleep habits. However, there are some limitations that can impact its accuracy and reliability.
Firstly, Fitbit's motion tracking can lead to misinterpretations. For example, it might classify periods of restless sleep as wakefulness or, conversely, record periods of inactivity as sleep. Additionally, Fitbit's heart rate sensors may struggle to accurately identify sleep stages due to natural heart rate variability. For instance, your heart rate may be higher if you exercise, eat a large meal, or consume alcohol before bed, affecting the accuracy of sleep stage identification.
The subjectivity of sleep stages is another factor. Sleep experts often use electroencephalography (EEG) and advanced methods to precisely categorise sleep stages, while Fitbit uses a simplified approach based on motion and heart rate. Fitbit sleep trackers also do not consider external factors such as room temperature, noise, or disturbances from partners or pets that can impact sleep quality.
Research has shown that Fitbit sleep trackers tend to overestimate total sleep time by about 10% and underestimate deep sleep and rapid eye movement (REM) sleep by about 20% each. This means your Fitbit may indicate that your sleep quality is worse than it actually is. Other sleep trackers, such as Apple watches, Garmin watches, Oura rings, or Whoop bands, have similar accuracy levels, with passable total sleep time estimates (~80-90%) but less precise sleep stage identifications (50-65%).
While Fitbit sleep tracking can provide valuable insights, it is not perfect and may not capture all the nuances of your sleep. Occasional missing sleep scores have been reported by users, but these issues are usually resolved by restarting the device, forcing a sync, or updating the app.
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Fitbit sleep tracking updates
Fitbit has recently rolled out an update to improve how it tracks your sleep. The update includes changes to the sleep stage tracking algorithm, which is now said to provide a "more precise measurement" of your sleep. This is particularly true when it comes to brief awakenings that the previous algorithm used to ignore. As a result, users may notice increased wake times and shifts in the overall breakdown of their sleep stages.
While this update may cause some users to see a decrease in their total sleep hours or shifts in their REM scores, it is important to remember that the new data is a more accurate reflection of your night's rest. Fitbit has confirmed that the update is not a bug but rather an improvement to the sleep tracking algorithm. Additionally, this update is just one of the first in a series of planned sleep-tracking improvements.
If you are experiencing issues with your Fitbit not tracking your sleep at all, there are a few things you can try. First, make sure that you are wearing your Fitbit on your wrist, as this is the best way to obtain the most accurate sleep tracking data. You can also try wearing your Fitbit higher on your arm or loosening or tightening the band to see if that improves the tracking. If you have tattoos on your wrist, try switching the Fitbit to the arm without tattoos, as this can also impact the tracking accuracy.
In some cases, you may need to force a sync by going to the home screen in the Fitbit app and pulling down from the top. You can also try restarting your Fitbit device and then deleting the previous night's sleep data from the app. After that, you can manually re-enter the start and stop times for your sleep, and you should receive a sleep score. Additionally, ensuring that you are running the latest version of the Fitbit app can fix a lot of issues.
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Frequently asked questions
Fitbit sleep scores have been known to go missing in the past, and this issue seems to be widespread. Fitbit usually re-adds the sleep score by mid-day, as the underlying data is still collected. To get your sleep score, restart your Fitbit device and then delete last night’s sleep from the Fitbit app.
To improve your Fitbit's sleep tracking, make sure that your Fitbit is worn snugly on your wrist, close to the pulse points. This will allow it to better measure your skin temperature, heart rate, and more. You should also ensure that you are running the latest version of the Fitbit app, as this can fix a lot of issues.
Fitbit devices are known for their sleep-tracking abilities, but they are not perfect. Sleep trackers can fail to properly record data, and this can happen for a variety of reasons. For example, if your band is too tight, it may not track your sleep.
To track your sleep with a Fitbit device, you must wear your Fitbit during sleep for at least 14 days during the previous month. Your sleep logs must include sleep stages data. You can then check your sleep data, such as your sleep score, in the Fitbit app.
