Gina Johnson
Fitbit's sleep-tracking technology is a popular feature that helps users understand their sleep patterns and improve their sleep quality. Fitbit devices with heart rate tracking can monitor sleep stages, including light sleep, deep sleep, and REM sleep, by using movement and heart rate patterns. When the device senses that the wearer hasn't moved for about an hour, it assumes they are asleep and begins tracking their sleep activity. In addition to sleep stages, Fitbit also provides a Sleep Score based on metrics such as heart rate and restlessness. Users can also set bedtime reminders and silent alarms to help maintain a consistent sleep schedule and wake up during the optimal sleep stage. While sleep staging data from Fitbit should be interpreted cautiously, as it may be less accurate than laboratory sleep studies, it can still provide valuable insights into overall sleep quality and help users make adjustments for more restorative sleep.
| Characteristics | Values |
|---|---|
| Sleep tracking | Automatic |
| Sleep score | Based on heart rate, time spent awake or restless, and sleep stages |
| Sleep stages | Light, heavy, and REM sleep |
| Sleep monitoring | Helps assess if the user is sleeping a healthy amount |
| Sleep data | Can be used to look for trends and patterns |
| Sleep goals | The app can remind users when it's time to sleep |
| Heart rate | Built-in heart rate monitor combines heart rate and movement data to develop a more accurate picture of sleep |
| Sleep schedule | Users can compare their actual sleep to a "benchmark" of how the average person of their age and sex sleeps |
| Premium features | More detailed breakdown of sleep score, access to guided programs, and snore detection |
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What You'll Learn
Fitbit sleep tracking features
Fitbit offers a range of sleep-tracking features to help you understand your sleep patterns and improve your sleep habits. Here are some key features:
Automatic Sleep Tracking
Fitbit devices offer automatic sleep tracking, so there's no need to manually activate sleep mode. The device senses when you've been still for about an hour and assumes you're asleep. It also detects small movements, such as rolling over, to confirm that you're asleep.
Sleep Stages
Fitbit breaks down your sleep into different stages: light sleep, deep sleep, and REM sleep. This helps you understand the quality of your sleep and spot any trends or changes in your sleep patterns.
Sleep Score
Fitbit provides a nightly sleep score based on heart rate, time spent awake or restless, and sleep stages. The score, out of 100, includes three components: sleep duration, sleep quality, and restoration. The restoration component measures how recharged your body should be the next day.
Sleep Insights and Recommendations
Fitbit Premium offers personalized insights and recommendations to help you improve your sleep. It provides a more detailed breakdown of your sleep and access to guided programs developed with sleep experts. These programs can help you build better daytime and nighttime habits for deeper sleep.
Snore Detection
Fitbit Premium subscribers with a Versa 3 or Fitbit Sense can access snore detection. This feature listens for snoring and other noises during the night, which can impact the quality of your sleep.
Sleep Goal Setting
The Fitbit app allows you to set sleep goals and receive reminders when it's time to go to bed, helping you establish a consistent sleep routine.
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How Fitbit devices detect sleep
Fitbit devices use a combination of methods to detect sleep. Firstly, they use movement data to determine when the wearer is asleep. If the device detects that the wearer hasn't moved for about an hour, it assumes they are asleep. It then confirms this by measuring small movements, such as rolling over in bed.
Secondly, if the Fitbit has a heart rate monitor, it combines this movement data with heart rate data to develop a more accurate picture of sleep. Certain Fitbits estimate sleep stages using "beat-to-beat changes in your heart rate", known as heart rate variability (HRV), which varies between light, deep, and REM sleep.
The Fitbit will also automatically detect when the wearer wakes up and will stop tracking their sleep. The wearer can then sync their Fitbit with the mobile app to review details about how they slept, including a breakdown of the different stages of sleep. This information can be used to look for trends and ways to improve sleep performance.
Fitbit Premium subscribers get access to more data, such as detailed information about the sounds they make at night. They also receive personalized insights and recommendations about how to improve their sleep, as well as a more detailed breakdown of their sleep, including a sleep score.
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Heart rate and sleep tracking
Fitbit devices come with built-in sleep monitoring that works automatically. The devices use a combination of movement and heart-rate patterns to estimate sleep stages. When the device senses that you haven't moved for about an hour, it assumes that you're asleep. It confirms this by measuring small movements, such as rolling over in your sleep. If your Fitbit has a heart rate monitor, it combines heart rate and movement data to develop a more accurate picture of your sleep. This is called heart rate variability (HRV), which is known to vary between light, deep, and REM sleep.
The Fitbit app provides a detailed breakdown of your sleep, including the time you spent in each stage of sleep: light, deep, and REM. It also shows the total hours you slept and the time spent below your resting heart rate. The app allows you to compare your sleep performance over time, helping you to identify trends and changes in your sleep patterns.
Fitbit Premium offers additional features for sleep tracking, including a daily sleep score breakdown and personalized insights and recommendations to improve your sleep. Premium subscribers can also access advanced sleep tracking features such as snore detection and detailed information about the sounds you make at night. The subscription costs $10 per month or $80 per year and provides access to guided meditations, exclusive video workouts, and other health insights such as blood oxygen level readings and breathing rate.
The overall sleep score provided by Fitbit is a sum of individual scores in three components: sleep duration, sleep quality, and restoration. The restoration component measures how recharged your body should be the next day and can be further analysed by checking the estimated oxygen variation graph. Most Fitbit users receive a sleep score between 72 and 83.
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Fitbit sleep staging
Sleep is an essential component of health, and its timing, duration, and quality are critical determinants of a person's overall health. Fitbit's sleep feature estimates sleep stages using a combination of movement and heart-rate patterns. When you haven't moved for about an hour, your tracker or smartwatch assumes that you're asleep. It confirms this by measuring small movements, such as rolling over in your sleep.
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's sleep researchers and the National Sleep Foundation describe the following sleep stages: Light sleep serves as your entry point into sleep each night as your body unwinds and slows down. This stage typically begins within minutes of falling asleep. During the early part of light sleep, you may drift between being awake and asleep, remaining somewhat alert and easily awoken. Your breathing and heart rate usually decrease slightly during this stage. Light sleep promotes mental and physical recovery.
Deep sleep typically occurs in the first few hours of sleep. When you wake up feeling refreshed in the morning, you likely experienced solid periods of deep sleep the night before. During deep sleep, you become harder to awaken since your body becomes less responsive to outside stimuli.
REM sleep is the final stage of sleep, where your brain becomes more active. Dreams mainly occur during REM sleep, and your eyes move quickly in different directions. Your heart rate increases, and your breathing becomes more irregular. In principle, muscles below the neck remain inactive to prevent you from acting out your dreams. REM sleep 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 so that it can be stored in your long-term memory.
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Fitbit sleep insights and analysis
Sleep is an essential component of health, playing a role in metabolic and emotional regulation, performance, and memory. Fitbit offers several tools and insights to help you understand your sleep patterns and improve your sleeping habits.
Fitbit's sleep feature estimates sleep stages using a combination of movement and heart-rate patterns. It tracks your sleep stages, such as light, deep, and REM sleep, and lets you compare your sleep performance over time. The overall sleep score is a sum of individual scores, including sleep duration, sleep quality, and restoration, for a total score of up to 100. The restoration component measures how recharged your body should be the next day, taking into account variations in blood oxygen saturation levels, which can indicate disturbances in breathing during sleep.
Fitbit Premium offers more in-depth insights and recommendations about your sleep. For $10 a month, you can access advanced sleep tracking features, such as snore detection and detailed information about the sounds you make at night. You can also set sleep goals and receive reminders when it's time to go to bed, helping you build a consistent sleep routine.
By wearing your Fitbit to bed and reviewing your sleep data in the morning, you can gain valuable insights into your sleep patterns. This information can help you identify trends, such as restless sleep or frequent wake-ups, and make informed decisions to improve your sleep quality. Additionally, you can compare your sleep to benchmarks, allowing you to see how your sleep aligns with the average person of your age and sex.
With Fitbit's sleep insights and analysis, you can take control of your sleep habits, make necessary adjustments, and ultimately improve your overall health and well-being.
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Frequently asked questions
Wear your Fitbit device to bed. Fitbit devices and Google Pixel Watch series automatically detect your sleep when your body is completely at rest and you haven't moved for about an hour.
Fitbit devices use your sleeping heart rate, movement and more to measure your time spent in each sleep stage and give you a personalised Sleep Score.
A Sleep Score is a personalised score based on heart rate, restlessness and more. It shows how well you slept.
A Sleep Profile is a detailed monthly analysis of 10 features identified by the Fitbit research team as most important for a cohesive picture of sleep quality and quantity. It includes sleep schedule variability, sleep start time, time before sound sleep, sleep duration, deep sleep, REM sleep, restorative sleep, and sleep stability.
While the Fitbit sleep tracker can be quite finicky in its recording of sleep stages, it is still a good way to get an objective read on your sleep quality.
