Gina Johnson
Fitbit devices are highly sought-after for their ability to not only track sleep but also provide a score and recommendations to improve sleep quality. Fitbit's sleep tracking feature is available to all users, while those with a Premium subscription can access deeper insights, including a breakdown of their scores and graphs based on time asleep, sleep stages, and restoration. Fitbit estimates sleep stages by using movement and heart-rate patterns, tracking beat-to-beat changes in heart rate, and monitoring the length of time when movements indicate sleep behavior. While REM sleep cannot be accurately measured without brain wave analysis, Fitbit's sleep staging has been found to be 69% accurate in any given 30-second time window. This guide will explore how Fitbit tracks REM sleep, the accuracy of its measurements, and the insights it provides to help users better understand and enhance their sleep.
| Characteristics | Values |
|---|---|
| How it works | Fitbit uses movement and heart-rate patterns to estimate sleep stages. |
| Tracking | It tracks beat-to-beat changes in heart rate, known as heart rate variability (HRV), to determine sleep stages. |
| Sleep stages | Light Sleep, Deep Sleep, and REM Sleep. |
| Sleep schedule | Users can set a sleep schedule and bedtime reminders in the app to maintain a consistent sleep pattern. |
| Sleep insights | Fitbit offers sleep insights and a sleep score to help users understand and improve their sleep. |
| Premium features | Premium subscribers can access deeper insights, snore and noise detection, and 300+ mindfulness sessions. |
| Accuracy | Fitbit sensors can classify sleep stages with 69% accuracy in a 30-second time window, according to a 2017 paper. |
| Limitations | Fitbit does not track breathing or oxygen saturation, which are important indicators of sleep quality and disorders. |
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What You'll Learn
How accurate is REM sleep tracking on Fitbit?
The accuracy of REM sleep tracking on Fitbit varies across different models and individual users. While Fitbit uses advanced sleep tools to track sleep, it is not a replacement for medical-grade tracking systems used by doctors.
Fitbit estimates sleep stages by using movement and heart-rate patterns. When the device detects no movement for about an hour, it assumes you are asleep. It then tracks 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. However, the accuracy of this method can be impacted by factors such as the position of your arm during sleep and the presence of a cardiac pacemaker.
Some users have questioned the accuracy of their REM sleep tracking, especially when compared to measurements of brain waves and electroencephalograms (EEGs) in a lab setting. Fitbit's sleep tracking may not accurately capture heart rate variability (HRV), which can impact the accuracy of REM sleep tracking.
On the other hand, some studies and user experiences suggest that the Fitbit Alta and Alta HR models are relatively accurate in tracking sleep stages, including REM sleep. The Smart Wake feature also helps users wake up during the optimal stage of sleep.
To improve the accuracy of your Fitbit sleep tracking, you can adjust the Sleep Sensitivity setting in the Advanced Settings of your Fitbit app. Additionally, wearing your Fitbit device consistently and ensuring a secure fit can help capture more accurate data.
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How does Fitbit track sleep?
Fitbit uses a combination of movement and heart-rate patterns to estimate your sleep stages. When you haven't moved for about an hour, your Fitbit assumes you're asleep. It also tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuates as you transition between light sleep, deep sleep, and REM sleep. When you sync your device in the morning, it uses this data to estimate your sleep cycles from the previous night.
While you sleep, your body typically goes through several sleep cycles that last around 90 minutes each. Each cycle alternates between two types of sleep: light sleep and deep sleep. Periods of deep sleep are usually longer earlier in the night, while REM sleep periods tend to be longer towards the end of the night. REM sleep is associated with vivid dreams and increased heart rate and rapid eye movement.
Fitbit divides sleep into four stages: Awake, REM, Light Sleep, and Deep Sleep. It's normal to have some awake minutes in your sleep stages, and you may not remember waking up since you likely fell back to sleep quickly. Fitbit's sleep tracking feature can help you understand your sleep patterns and notice any variations.
In addition to sleep tracking, Fitbit offers tools to help you improve your sleep quality. You can set a sleep schedule, explore sleep insights, and set bedtime reminders to help you maintain a consistent sleep routine. Fitbit also provides a Mindfulness tool with mindfulness sessions and weekly goals to help you unwind before bed.
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How to improve your sleep score on Fitbit
To improve your sleep score on Fitbit, you must first understand how Fitbit calculates your sleep score. Fitbit uses your movement and heart-rate patterns to estimate your sleep stages and cycles. It tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), to determine how much time you spent in each sleep stage: light sleep, deep sleep, and REM sleep.
- Understand your sleep data and patterns: Review your sleep data and patterns over time to identify areas for improvement. Fitbit provides a breakdown of your sleep score, showing how it was calculated based on your time asleep, sleep stages, and restoration. By understanding how each stage contributes to your overall score, you can make targeted improvements.
- Maintain a consistent sleep schedule: Set a sleep schedule in the Fitbit app and try to stick to it. Going to bed and waking up at consistent times can improve your sleep quality and score.
- Practice mindfulness and meditation: Fitbit offers mindfulness tools in the app, including mindfulness sessions, weekly goals, and stress level reflections. Meditation has been proven to improve sleep quality and can help you unwind before bed.
- Limit screen time before bed: Disengage from screens and electronics at least an hour before bedtime. The blue light emitted by electronic devices can interfere with your sleep hormones and make it harder to fall asleep, negatively impacting your sleep score.
- Optimize your sleep environment: Ensure your bedroom is cool, dark, and quiet. Consider using earplugs, eye masks, or white noise machines to create a comfortable sleep environment.
- Engage in physical activity during the day: Regular physical activity can improve your sleep quality. However, avoid strenuous exercises close to bedtime, as it may make it harder to fall asleep.
- Establish a relaxing bedtime routine: Engage in relaxing activities before bed, such as reading, listening to soothing music, or taking a warm bath. A bedtime routine can signal to your body that it's time to wind down and prepare for sleep.
- Address sleep disorders: If you suspect you have a sleep disorder, such as sleep apnea, consult a healthcare professional. Fitbit cannot diagnose sleep disorders, but it can provide insights that you can share with your doctor.
- Upgrade to Fitbit Premium: Fitbit Premium offers deeper insights into your sleep, including a detailed analysis of your Sleep Score, graphs, and personalized guidance on improving your sleep quality.
Remember, improving your sleep score takes time and consistency. Experiment with different strategies and pay attention to how your body responds. Everyone's sleep needs are unique, so tailor your approach based on your Fitbit data and personal preferences.
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How to track sleep apnoea with Fitbit
Sleep apnea is a sleep disorder that causes individuals to experience disruptions in breathing while they sleep. Obstructive sleep apnea (OSA) is the most common form, where the muscles or tissues in the upper airway collapse, preventing the individual from breathing temporarily. These breathing disruptions can lead to serious health issues such as high blood pressure, stroke, and cardiovascular disease.
Wearable devices, such as Fitbit, have the potential to inform individuals of these breathing issues early on so they can seek medical advice. While Fitbit cannot diagnose sleep apnea, it can track oxygen levels and breathing disruptions, as well as heart rate and sleep patterns, to help identify possible health conditions.
To track your sleep with a Fitbit, you should wear the device on your non-dominant arm. The Fitbit will then use your movement and heart rate patterns to estimate your sleep stages and cycles. It is important to note that the Begin Sleep Now option in the Fitbit app should not be used as the device needs to track your sleep data and heart rate variability automatically.
If you have a Premium subscription, you can turn on the snore and noise detection feature to track snoring, which is a major symptom of sleep apnea. The data from your Fitbit can be shared with a doctor, who may recommend a sleep study or other tests to determine if you have sleep apnea and require treatment.
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How to use Fitbit's sleep insights to improve sleep
Sleep is divided into four stages: awake, light sleep, deep sleep, and REM sleep. 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, while REM sleep periods tend to be longer towards the end of the night.
Fitbit uses your movement and heart-rate patterns to estimate your sleep stages. It assumes you're asleep when you don't move for about an hour, and it tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), to determine how much time you spend in each sleep stage.
- Create a sleep schedule: Maintaining a consistent sleep pattern is essential for good sleep. The Fitbit app allows you to set a sleep schedule and bedtime reminders to help you stick to your sleep goals.
- Understand your sleep habits: Fitbit provides sleep insights that show you how much time you spend in each sleep stage. This information can help you identify any issues with your sleep, such as spending too much time awake or not enough time in deep sleep.
- Adjust your sleep sensitivity: If you find that your Fitbit isn't properly responding to movements during sleep, you can adjust the Sleep Sensitivity setting. Go to the Account tab, scroll down to Advanced Settings, and choose between Normal or Sensitive mode.
- Meditation and mindfulness: The Fitbit app includes mindfulness sessions and meditation tools to help you unwind before bed and improve your sleep quality.
- Limit screen time before bed: To promote better sleep, it's recommended to disengage from screens and electronics at least an hour before bedtime.
- Premium features: Fitbit Premium offers deeper insights into your sleep, including a detailed analysis of your Sleep Score, graphs, and guidance on improving your sleep quality.
While Fitbit can provide valuable insights into your sleep patterns, it's important to note that it may not always be completely accurate. If you have concerns about your sleep health, consider sharing the information with your doctor.
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Frequently asked questions
Fitbit uses movement and heart-rate patterns to estimate sleep stages. It tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), to determine how much time you spent in each sleep stage: light sleep, deep sleep, and REM sleep.
According to a 2017 paper published by Fitbit scientists, the watch's sensors can classify sleep stages with 69% accuracy in any given 30-second time window. However, some users have questioned the accuracy of REM sleep tracking, especially when compared to proper REM measurement through brain waves.
To improve sleep tracking, ensure your Fitbit is secure on your non-dominant hand, and your arm is in a position to allow proper heart rate recording. Additionally, you can adjust the Sleep Sensitivity in the Fitbit app to either Normal or Sensitive mode.
The Sleep Score in Fitbit is a sum of individual scores in sleep duration, sleep quality, and restoration, with a maximum score of 100. The score is based on the time spent in light sleep, deep sleep, and REM sleep, with longer durations of deep and REM sleep resulting in a higher score.
While Fitbit can help track your sleep patterns and notice variations, it is not meant to be a substitute for medical diagnosis. If you have concerns about your sleep health, it is recommended to share the information with your doctor. Fitbit is currently collecting clinical data to develop features for sleep apnea screening.
