Ashwin Lewis
Fitbit devices are mostly known for tracking steps, calories, and cardio. However, one of the most useful features of the Fitbit smartwatch is its ability to monitor sleep. Fitbit devices can track sleep by monitoring the amount of time spent sleeping as well as the quality of sleep. The Fitbit app can also be used to set sleep schedules and bedtime reminders to help users achieve their sleep goals. While Fitbit devices can track sleep, they are not intended to diagnose or treat any medical conditions and should not be relied on for any medical purposes.
| Characteristics | Values |
|---|---|
| Fitbit devices that track sleep | Fitbit Inspire 3, Fitbit Versa, Fitbit Sense, Fitbit Charge HR, Fitbit Surge, Fitbit smartwatches and trackers, Google Pixel Watch series |
| How it works | Automatically detects sleep when the body is completely at rest and hasn't moved for about an hour |
| How to use | Wear the device to bed on your wrist, in a snug wristband |
| Data tracked | Time spent awake, restless, and asleep; sleep duration, quality, and restoration; heart rate; sleep stages; blood oxygen saturation; sleep goals; sleep schedule; snore and noise detection |
| Additional features | Set bedtime reminders, access to a library of workout videos and audio tracks, guided meditations, and sleep aids |
| Accuracy | Fitbit sensors can classify sleep stages with 69% accuracy in any given 30-second time window; no systematic bias to how much light sleep, deep sleep, or sleeplessness is estimated |
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What You'll Learn
Fitbit sleep tracking accuracy
While Fitbit's sleep-tracking technology may sound impressive, it does have some limitations that can impact its accuracy and reliability. The accuracy of a Fitbit sleep tracker depends on several factors, including motion tracking, heart rate monitoring, and machine learning.
Fitbits use accelerometers to detect movement during sleep. When you’re in a deep sleep, you generally move less, while in REM sleep and lighter sleep stages, you tend to move more. However, this reliance on motion tracking can lead to inaccuracies. For example, it might interpret periods of restless sleep as periods of wakefulness, or classify periods where you are awake but not moving as sleep.
Fitbits also monitor your heart rate throughout the night to estimate periods of wakefulness. However, heart rate can vary wildly, even during sleep. For example, your heart rate is likely to be higher if you exercise, eat a large meal, or drink alcohol before bed. As a result, Fitbit’s heart rate sensors may struggle to accurately identify sleep stages.
Fitbit uses a machine learning algorithm to analyse your movement and heart rate data. This algorithm considers factors such as motion tracking and heart rate monitoring to estimate your sleep duration and quality.
Research has shown that Fitbit sleep trackers tend to overestimate total sleep time by about 10% and underestimate measures of deep sleep and REM sleep by about 20% each. As a result, your Fitbit may tell you that your sleep is worse than it actually is.
Despite these limitations, many users have found Fitbit sleep trackers to be fairly accurate and helpful in understanding their sleep patterns. Some have praised the compactness, lightweight design, and long battery life of Fitbit devices. The ability to edit sleep periods and set sleep goals within the Fitbit app also adds to the convenience of using a Fitbit for sleep tracking.
In conclusion, while Fitbit sleep trackers may not be perfectly accurate, they can still provide valuable feedback on your sleep habits and help you make informed decisions to improve your sleep quality.
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Fitbit sleep score
Fitbit offers a range of devices and features that can help you track and improve your sleep. While there is no Fitbit device that only tracks sleep, the company's range of smartwatches and trackers can monitor your sleep patterns and provide insights to help you get better rest.
The Fitbit Sleep Score is a feature that gives you a quick way to gauge your sleep quality. It is calculated based on your heart rate, the time spent awake or restless, and your sleep stages. The overall sleep score is the sum of individual scores for sleep duration, sleep quality, and restoration, with a maximum score of 100. The average sleep score typically ranges from 72 to 83.
To access your sleep score, you can swipe up from the clock face on your Fitbit device or use the Fitbit app. In the app, you can tap the ""Sleep duration" tile and then the "Sleep score" tile to see your individual scores for each metric that contributes to your overall sleep score. You can also view your sleep stats over time, including monthly and yearly sleep data.
In addition to the basic sleep tracking features, Fitbit Premium offers more detailed insights and tools to help improve your sleep. With a Premium subscription, you can access a breakdown of your restoration score, which is based on your sleeping and resting heart rates and how much you toss and turn during the night. Fitbit Premium also includes guided programs developed with sleep experts, such as "Habits for Restful Sleep" and "Get More Sleep," which offer personalized guidance and relaxation tools to help you achieve deeper sleep.
It's important to note that while Fitbit's sleep tracking features can provide valuable insights, they are not intended to diagnose or treat medical conditions. If you have concerns about your sleep or health, it is recommended to consult a healthcare professional.
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Fitbit sleep stages
While there is no Fitbit that only tracks sleep, the company's range of fitness trackers and smartwatches can all monitor sleep. This includes devices like the Fitbit Inspire 3, Fitbit Charge 5, Fitbit Sense, and Fitbit Versa 3.
Fitbits can track different sleep stages, including REM sleep, deep sleep, and light sleep. REM sleep is the stage where most dreaming occurs, deep sleep is a restorative phase for the mind and body, and light sleep is the time spent outside of REM or deep sleep. The Fitbit app also provides a Sleep Score, which is calculated based on the time asleep (50% of the score), the amount of time spent in deep and REM sleep (25%), and restoration (25%). The restoration component reflects how much of an individual's sleep time is below their resting heart rate.
Fitbits use physical movement, pulse rate, and breathing to infer which sleep stage a person is in. However, it is important to note that sleep staging data from Fitbits should be interpreted with caution as it may be less accurate than data from a laboratory sleep study.
Tracking Sleep with Fitbit
Fitbit devices automatically detect sleep when worn to bed. To get the most accurate readings, it is recommended to wear the device snugly on the wrist. The Fitbit app allows users to set sleep goals, receive bedtime reminders, and view detailed sleep stats, including sleep duration and sleep quality. Additionally, the premium version offers more insights, such as a daily sleep score breakdown and guided programs developed with sleep experts to improve sleep habits.
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Fitbit sleep schedule
While there is no Fitbit that only tracks sleep, the Fitbit app can be used to set a sleep schedule, helping you to achieve your sleep goals and establish a consistent sleep routine. You can set a bedtime reminder in the app, which will send you a notification on your phone when it's time to wind down for bed. Certain Fitbit devices will also display a bedtime reminder on the device itself. By default, bedtime reminders are set for Sunday through Thursday (common work or school nights), but you can change which days you receive reminders in the app.
Wrist-based Fitbit devices and Google Pixel Watch series automatically detect your sleep when you wear the device to bed. It is recommended that you wear your device in a snug wristband during sleep. When your body is completely at rest and you haven't moved for about an hour, your device records that you're asleep. If your device doesn't track heart rate, you can check your sleep pattern in the Fitbit app. Your sleep pattern includes your time spent awake, restless, and asleep. If your device detects excessive movement, it will record this time as being awake. Fitbit devices that do track heart rate (except Charge HR and Surge) also track sleep stages.
If you have a Fitbit Premium subscription and a compatible device, you can access a sleep profile. To be eligible for a sleep profile, you must wear your Fitbit during sleep for at least 14 days during the previous month (these do not have to be consecutive days). Your sleep logs must include sleep stages data. The more sleep you log, the more closely your sleep profile will reflect your patterns. You can check your sleep profile on the first of each month in the Fitbit app or on your Fitbit device.
You can also set a sleep schedule on your Fitbit device. On the Versa/2, swipe to the settings app, scroll down to sleep mode, tap it, then scroll down to schedule and tap customise. You will be able to set a start and finish time for your sleep.
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Fitbit sleep insights
Sleep is an essential component of health and well-being. Fitbit offers a range of tools to help you understand and improve your sleep patterns and habits. Here are some insights into how Fitbit can help you track and optimize your sleep:
Automatic Sleep Tracking:
Fitbit devices with wrist-based trackers or smartwatches automatically detect your sleep when worn to bed. The device records your sleep when your body is completely at rest and hasn't moved for about an hour. It also detects restless sleep through your body movements.
Sleep Stages and Quality:
Fitbit devices with heart rate tracking can monitor your sleep stages, including light, deep, and REM sleep. This helps you understand the quality of your sleep. The Fitbit app provides a detailed breakdown of your sleep patterns, allowing you to see your time spent awake, restless, and asleep.
Sleep Score:
The Fitbit Sleep Score is calculated based on sleep duration, sleep quality, and restoration. The restoration component includes estimated oxygen variation, which can indicate breathing disturbances during sleep. Most Fitbit users receive a sleep score between 72 and 83.
Premium Content:
Fitbit Premium offers additional insights and tools to improve your sleep. It includes a daily sleep score breakdown, personalized guidance, and guided programs developed with sleep experts. These programs provide tips for achieving deeper sleep and improving your nighttime routine.
Snore and Noise Detection:
Fitbit devices like the Fitbit Sense and Versa 3 have a snore and noise detection feature. This feature uses the device's microphone to track noise levels and check for snoring throughout the night, providing a summary report when you wake up.
Setting Sleep Goals:
The Fitbit app allows you to set sleep goals and create a sleep schedule. You can set bedtime and wake-up time targets, receive reminders, and track your progress. This helps you establish a consistent sleep routine, which is essential for overall well-being.
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Frequently asked questions
No, there is no Fitbit that only tracks sleep. However, sleep tracking is a feature of all Fitbits.
Fitbit devices automatically detect your sleep when you wear your device to bed. They record the amount of time you're asleep as well as the quality of the sleep you're getting. If your device has a heart rate monitor, it can tell the difference between light, deep, and REM sleep.
According to a paper published by Fitbit scientists in 2017, the watch's sensors can classify sleep stages with 69% accuracy in any given 30-second time window. While this accuracy may seem low, there is no systematic bias to how much light sleep, deep sleep, or sleeplessness Fitbit estimates.
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. Most Fitbit users get a sleep score between 72 and 83.
Simply wear your Fitbit to bed. If your device doesn't track heart rate, you can check your sleep pattern in the Fitbit app. Your sleep pattern includes your time spent awake, restless, and asleep. If your device has a heart rate monitor, you can also track your sleep stages.
