Evie Summers
Fitbit's sleep-tracking technology has been designed to help users get better rest, boost energy, and improve their overall well-being. The device automatically detects when the wearer has fallen asleep and tracks their sleep patterns and stages by monitoring heart rate and movement. It records the time the wearer falls asleep and wakes up, and sets a bedtime in accordance with the wearer's sleep goals to ensure they get enough rest. The Fitbit app provides a personalized sleep score and analysis of key sleep metrics, allowing users to understand their sleep patterns and make adjustments to their sleep environment and daytime habits to improve sleep quality.
| Characteristics | Values |
|---|---|
| How does it work? | It uses a combination of movement and heart rate metrics to help determine sleep patterns and <co: 5,7,16>estimate sleep stages. |
| How does it detect sleep? | When you haven't moved for about an hour, your tracker or smartwatch assumes that you're asleep. |
| How does it track sleep patterns and sleep stages? | It monitors heart rate and movement. |
| How does it help? | It helps you determine what factors to change to achieve the most restorative sleep. |
| How does it sync? | Your Fitbit will usually sync automatically when it's near your phone and you open the Fitbit app. |
| How does it help with sleep goals? | It records the time you typically wake up and sets your bedtime in accordance with your sleep goals to ensure you get enough rest. |
| How does it help with sleep schedules? | It offers bedtime reminders to help you maintain a consistent sleep schedule. |
| How does it help with sleep analysis? | It provides a monthly personalized analysis of 10 key metrics to help you improve your sleep habits and quality. |
| How does it help with sleep quality? | It provides a silent alarm that goes off during the optimal stage of sleep to help you feel more rested when you wake up. |
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What You'll Learn
How does Fitbit detect sleep?
Fitbit devices use a combination of motion detection and heart rate monitoring to track your sleep. The motion detection is measured by built-in accelerometers, which indicate when you toss and turn or get out of bed during the night. The heart rate monitoring estimates when you transition between sleep stages.
When you wear your Fitbit device to bed, it will automatically detect your sleep when your body is completely at rest and you haven't moved for about an hour. It will then begin tracking your sleep activity. If your device doesn't track your heart rate, you can still check your sleep pattern in the Fitbit app, which will include your time spent awake, restless, and asleep. If your device detects excessive movement, it will record this time as being awake, as restful sleep is assumed to be impossible during such periods.
While you're sleeping, your Fitbit device tracks 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, your Fitbit uses movement and heart rate patterns to estimate sleep cycles from the previous night.
The Fitbit Sleep Score 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 individual scores in 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.
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How does Fitbit track sleep?
Fitbit's sleep-tracking technology is based on monitoring your heart rate and movement throughout the night. When your body is completely at rest and you haven't moved for about an hour, your Fitbit device records that you're asleep. It then tracks 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.
The Fitbit uses movement metrics, measured by built-in accelerometers, to indicate when you toss and turn or get out of bed during the night. It also uses heart rate data to estimate when you move from one sleep stage to the next. If you wear your Fitbit to bed, it will automatically begin tracking your sleep activity when your body is completely relaxed and hasn't moved for an hour.
The resulting data can help you determine what factors to change in order to achieve the most restorative sleep. Fitbit offers fitness trackers and smartwatches that track a variety of health metrics, including sleep habits. Fitbit Premium also has guided programs developed with sleep experts to help you build better daytime habits and improve your nighttime routine.
To view your sleep data, sync your Fitbit device in the morning by opening the Fitbit app and tapping the sleep duration tile. Swipe down to the Sleep timeline graph. Press and hold the graph and move your finger left or right to check your sleep stages. You can also tap the Benchmark or 30-day average tabs to compare your sleep stage estimates from the previous night to the averages of others in the same age range and sex.
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How does Fitbit monitor sleep stages?
Fitbit devices monitor sleep stages by tracking sleep patterns and heart rate. Wrist-based Fitbits and Google Pixel Watches automatically detect sleep when worn to bed. They record sleep when the device hasn't moved for about an hour, indicating that the body is completely at rest. The device then tracks the beat-to-beat changes in the user's heart rate, known as heart rate variability (HRV). These numbers fluctuate as the user transitions between light sleep, deep sleep, and REM sleep stages.
The Fitbit app provides a Sleep Score based on heart rate, time spent awake or restless, and sleep stages. The overall sleep score is a sum of individual scores in three components: sleep duration, sleep quality, and restoration, for a total score of up to 100. The Fitbit also offers a monthly personalized analysis of 10 key metrics to help improve sleep habits and quality.
Fitbit's sleep researchers and the National Sleep Foundation have defined the following sleep stages: Light sleep, which serves as the entry point into sleep each night, typically begins within minutes of falling asleep. During this stage, the user may drift between being awake and asleep, remaining somewhat alert and easily awoken. The user's breathing and heart rate usually decrease slightly during this stage. Deep sleep typically occurs in the first few hours of sleep, and the user becomes harder to awaken since their body becomes less responsive to outside stimuli. REM sleep, or rapid eye movement sleep, is associated with vivid dreams and plays an important role in mood regulation, learning, and memory.
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How does Fitbit help improve sleep?
Fitbit devices monitor your sleep by tracking your sleep patterns and sleep stages. They do this by monitoring your heart rate and movement. When you wear your Fitbit to bed, it automatically detects when you fall asleep and starts tracking. It senses that you are asleep when you haven't moved for about an hour. It then tracks 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.
Fitbit's sleep researchers and the National Sleep Foundation describe the following sleep stages: Light sleep, which serves as your entry point into sleep each night as your body unwinds and slows down; Deep sleep, which typically occurs in the first few hours of sleep, and makes you harder to be awakened since your body becomes less responsive to outside stimuli; and REM sleep, which has been shown to play an important role in mood regulation, learning, and memory as your brain processes and consolidates information from the previous day.
The Fitbit app allows you to sync your device in the morning to view your sleep data. You can swipe down to the Sleep timeline graph and press and hold on the graph to check your sleep stages. The benchmark is based on published data to show how your sleep stage estimates from the previous night compare to the averages of others in the same age range and sex. The graph displays the typical range for each sleep stage as a shaded area. You can also check your sleep pattern in the app, which includes your time spent awake, restless, and asleep.
Fitbit Premium offers guided programs developed with sleep experts, including Habits for Restful Sleep, which helps you build better daytime habits to achieve deeper sleep at night, and Get More Sleep, which helps you improve your nighttime routine and work towards longer sleep with goals and relaxation tools. Fitbit also allows you to set bedtime reminders to help you maintain a consistent sleep schedule, and a Smart Wake feature designed to wake you when you are in a stage of light sleep, which can help you feel more rested when you wake up.
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How does Fitbit's sleep tracking compare to other methods?
Fitbit devices with heart rate monitors can determine the differences between light sleep, deep sleep, and REM sleep. The Sleep Profile feature, which provides a more detailed analysis of sleep, is only available on certain models, including the Charge 5, Charge 6, Inspire 2, Inspire 3, or Luxe tracker, or any Sense or Versa watch (barring the first Versa model from 2018). The Sleep Profile feature costs $10 a month and provides a range of insights, including sleep trends and how they compare to others of the same age and gender.
Fitbit's sleep tracking is based on heart rate variability (HRV), which measures beat-to-beat changes in heart rate. This data, along with movement patterns, is used to estimate sleep stages. Fitbit devices automatically detect sleep when the user has not moved for about an hour and has a resting heart rate.
Compared to other methods, Fitbit's sleep tracking offers a convenient and comfortable way to monitor sleep. The wristband devices are popular due to their ability to provide sleep pattern estimations in free-living conditions at a low cost. Fitbit's performance has been evaluated against laboratory PSG (polysomnography), the gold standard for sleep assessment, and while it overestimates TST (total sleep time) and SE (sleep efficiency) and underestimates WASO (wake after sleep onset), it determines SOL (sleep onset latency) accurately.
It is important to note that Fitbit's sleep tracking may not be as accurate as laboratory methods, and one-night readings should be interpreted with caution. However, Fitbit does not systematically over or underestimate sleep stages, and there is no bias in its estimations. Additionally, Fitbit scientists have found no significant differences between readings from watches worn on each wrist.
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Frequently asked questions
Fitbit devices monitor sleep by tracking the beat-to-beat changes in heart rate, known as heart rate variability (HRV). These numbers fluctuate as the user transitions between light sleep, deep sleep, and REM sleep stages. Fitbits also use movement data to determine whether the user is asleep or awake.
To track your sleep with a Fitbit, simply wear it to bed. The device will automatically start tracking once it recognises that your body is going into sleep mode. It is recommended that you wear the device in a snug wristband during sleep.
You can view your sleep data in the Fitbit app or on your Fitbit device. To access your sleep data in the app, open the “Today” tab and tap the “Sleep duration” tile.
