Gina Johnson
Fitbit devices are popular sleep trackers due to their ease of use and compatibility with both iPhones and Androids. All models that monitor heart rates automatically track sleep. Fitbit trackers and watches use your sleeping heart rate, movement, and other data to measure your time spent in each sleep stage and give you a personalized Sleep Score. Sleep tracking, sleep stages, Sleep Score, and Smart Wake are available on trackers and watches with heart rate tracking. Fitbit devices that track heart rate (except Charge HR and Surge) also track sleep stages. The Fitbit Versa uses an accelerometer and optical photoplethysmography to track sleep.
| Characteristics | Values |
|---|---|
| Fitbit models with sleep cycle tracking | Google Pixel Watch 2, Google Pixel Watch, Sense 2, Sense, Versa 4, Versa 3, Versa 2, Charge 6, Charge 5, Inspire 3, Inspire 2, Luxe, Charge HR, Surge |
| Sleep tracking method | Heart rate tracking, movement tracking, and other data |
| Sleep tracking features | Sleep stages, Sleep Score, Smart Wake, Sleep Profile, monthly sleep analysis, sleep sensitivity setting, sleep duration, sleep history, sleep heart rate, sleep timeline graph, sleep sensitivity setting |
| Additional features | Silent alarms, Snore & Noise Report, SpO2 sensor for measuring blood oxygenation |
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What You'll Learn
- Fitbit models with heart rate tracking can track sleep stages
- Fitbit devices without heart rate tracking can't deliver info on sleep stages
- Fitbit Sense and Versa 3 can track snoring and noise
- Fitbit Versa has an SpO2 sensor for measuring blood oxygenation
- Fitbit's Sleep Score is based on a number of metrics
Fitbit models with heart rate tracking can track sleep stages
Fitbit trackers and watches use your sleeping heart rate, movement, and more to measure your time spent in each sleep stage and give you a personalized Sleep Score that shows how well you slept. Each night, your body cycles through different sleep stages based on your heart rate, and getting enough time in each one is key to feeling refreshed. Light sleep, for example, strengthens memory and learning, while deep sleep enables physical recovery, and REM sleep helps with strategic thinking and creativity.
You can use the Fitbit app to check your sleep stats for the desired week, month, or year. Tap on a specific sleep session to check your sleeping heart rate for that period. Touch and hold the chart, then drag left or right to check your sleep details. You can also check your averages for the week or longer periods of time for certain sleep stats, including hours slept, sleep score, sleep schedule, and sleep stages.
To track your sleep with a Fitbit device, you must wear it during sleep. Your sleep must be at least 3 hours long to receive a Snore & Noise Report. The device will only use the microphone to register noise level and snores and will not save any audio recordings. This feature is intended to provide information that can help you manage your well-being.
Fitbit Premium offers several tools that may help you get better sleep, including a daily sleep score breakdown that can help you understand where you can improve your sleeping habits and receive personalized guidance. Fitbit Premium also has guided programs developed with sleep experts, including Habits for Restful Sleep and Get More Sleep.
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Fitbit devices without heart rate tracking can't deliver info on sleep stages
Fitbit devices are popular for their ability to monitor health, physical activities, exercise routines, diet, and overall sleep quality. They are equipped with powerful heart rate monitors and other health-tracking sensors to help users keep tabs on their resting heart rate and overall fitness.
While Fitbit devices are excellent at tracking sleep, not all models can provide the same level of insight. Fitbit devices that do not have heart rate tracking capabilities will not be able to deliver information on sleep stages. This is because sleep cycles are traditionally studied using electroencephalography (EEG) and electrocardiography (ECG) sensors, and without heart rate tracking, the device lacks the necessary data to estimate sleep stages accurately.
Fitbit devices with heart rate tracking can monitor sleep stages by tracking the beat-to-beat changes in heart rate, known as heart rate variability (HRV). These changes fluctuate as the wearer transitions between light sleep, deep sleep, and REM sleep stages. By analyzing the patterns, Fitbit can provide a personalized sleep score and insights into the duration spent in each sleep stage.
However, for Fitbit devices without heart rate tracking, the sleep data will be more limited. These devices can still provide information on sleep patterns, including the time spent awake, restless, and asleep. "Restless sleep" refers to movements during sleep, such as tossing and turning. While this data is valuable, it does not offer the same level of insight into sleep stages as devices with heart rate tracking.
It is important to note that even for Fitbit devices with heart rate tracking, there may be instances where sleep data is not accurately captured. Factors such as wearing the device too loosely or in an improper position can affect the heart rate reading. Additionally, short naps or sleep sessions under three hours may not provide enough data for a comprehensive sleep stage analysis.
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Fitbit Sense and Versa 3 can track snoring and noise
Fitbit has long been a leader in sleep tracking technology. Its 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 that shows how well you slept. Fitbit's sleep tracking technology has recently been improved with the addition of overnight snore and noise detection. This feature is available on the Fitbit Sense and Versa 3.
The microphone on the Fitbit Sense and Versa 3 will collect information about the noise in your environment every few seconds once the tracker has determined you are asleep. The device will analyse noise levels and look for snore-specific noises. This feature is designed to help users determine patterns of disrupted sleep.
To enable the new sleep feature, open your Fitbit app and tap on the Sleep section. Read through and follow the onscreen prompts to learn more about the feature and enable it on your device. Then, simply wear your Fitbit Sense or Versa 3 to bed and check your results in the morning. The Fitbit app will display your snoring data along with your usual sleep data.
It is important to note that this feature requires a monthly Premium subscription and will have some impact on battery life. Fitbit recommends that your device is charged to at least 40% before going to bed. If you are concerned about your snoring, you can turn the feature off at any time and delete any data collected.
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Fitbit Versa has an SpO2 sensor for measuring blood oxygenation
Fitbit devices use a combination of movement and heart rate patterns to estimate sleep cycles. The Fitbit Versa 2, for instance, comes with an SpO2 sensor that can measure blood oxygenation levels. This sensor uses red and infrared lights on the back of the device, which are shone onto the skin and blood vessels. The lights that bounce back are then used to estimate the amount of oxygen in the blood. Well-oxygenated blood reflects more red light, while poorly oxygenated blood reflects more infrared light. This data is then used to generate an Estimated Oxygen Variation (EOV) graph, which shows the variability of oxygen levels in the bloodstream. This feature is designed to help users uncover changes in their fitness and wellness.
The SpO2 app is available for the Fitbit Charge 4, Charge 5, Charge 6, Inspire 3, Luxe, Sense series, Versa 3, and Versa 4. For the Inspire 3, Sense series, and Versa series, the SpO2 clock face can be installed to collect SpO2 data. The SpO2 data is not available in all regions, and it is important to note that it is not intended for medical purposes.
The Fitbit Versa 2 also has a sleep apnea feature, which can be useful for those with breathing issues. This feature has been long-awaited by Fitbit users, as the company had previously promised its release for the Versa 1. The SpO2 sensor on the Versa 2 is used primarily for the sleep score, and it may also be used for fitness tracking.
The Fitbit Versa 3 and Fitbit Sense also have a similar feature, allowing users to view their SpO2 trends over the past week without a premium membership. This feature is available through the free SpO2 Signature clock face on the user's smartwatch.
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Fitbit's Sleep Score is based on a number of metrics
Fitbit's Sleep Score is a personalised feature that provides insights into your sleep data. It is based on a multitude of metrics, including:
- Heart rate: Fitbit measures your sleeping heart rate and resting heart rate. Sleeping heart rate is detected continuously throughout the night, while resting heart rate is estimated each day when you are still and well-rested.
- Time spent in each sleep stage: Fitbit measures the time spent in light sleep, deep sleep, and REM sleep. Light sleep is the entry point into sleep each night as your body unwinds and slows down. Deep sleep enables physical recovery, and REM sleep helps with strategic thinking and creativity.
- Restlessness: Fitbit tracks your movements during sleep, including rolling over or tossing and turning.
- Breathing: Fitbit can track oxygen saturation in your blood during the night, providing insights into your breathing patterns.
- Noise and snoring: Fitbit devices with a microphone, such as the Fitbit Sense and Versa 3, can track noise levels and snoring throughout the night.
The Sleep Score feature is available on Fitbit trackers and watches with heart rate tracking capabilities, including the Google Pixel Watch series. The data is synchronised with the Fitbit app, allowing users to review their sleep data, set sleep goals, and make informed decisions to improve their sleep habits and overall sleep quality.
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Frequently asked questions
No, only Fitbit models that monitor heart rates have sleep cycle tracking.
Fitbit uses a combination of movement and heart rate metrics to help determine sleep patterns and estimate sleep stages.
Sleep can be broadly divided into rapid eye movement (REM) sleep and non-REM (NREM) sleep. The former is when a person is most likely to be dreaming, and the latter is when a person is more likely to be in a dreamless sleep.
To track your sleep with a Fitbit device, you must wear the device during sleep. Fitbit devices that track heart rate (except Charge HR and Surge) also track sleep stages.
To check your sleep data, open the Fitbit app and tap the "Today" tab. Then, tap the "Sleep" tile, and select the desired sleep log.
