Evie Summers
Fitbit devices can track your sleep patterns and estimate your sleep stages by using your movement and heart-rate patterns. When you haven't moved for about an hour, your Fitbit assumes that you're asleep and starts tracking your sleep stages. While you sleep, your 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. REM sleep, or rapid eye movement sleep, is the stage of sleep associated with vivid dreams and conscious experiences. During this stage, your brain becomes more internally synchronized, allowing less information to be processed.
| Characteristics | Values |
|---|---|
| Sleep stages | REM, Light, Deep |
| Sleep cycle duration | 90 minutes on average |
| REM sleep | Associated with vivid dreams |
| REM sleep duration | Typically longer as the night goes on |
| Sleep cycle | Light sleep, Deep sleep, Light sleep, REM sleep |
| Sleep cycle repeat | Common but sleep patterns vary naturally |
| Sleep tracking | Based on movement and heart-rate patterns |
| Sleep status confirmation | Length of time of movements indicating sleep behavior |
| Heart rate variability | Tracked by Fitbit |
| Sleep cycle estimation | Based on movement and heart rate patterns |
| Sleep score | Based on heart rate, time spent awake/restless, and sleep stages |
| Sleep staging accuracy | 69% in a 30-second time window |
| REM sleep accuracy | Overestimated but corrected by Fitbit algorithm |
| REM sleep and heart rate | May be affected by cardiac pacemaker |
| REM sleep and age | Produced less with age |
| REM sleep and dreams | Fitbit may confuse with light or awake stages |
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What You'll Learn
REM sleep is associated with vivid dreams
Sleep is divided into two main types: rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. REM sleep is associated with vivid dreams, and it is the stage of sleep where a person is most likely to be dreaming. Dreaming occurs during REM sleep because of the vivid consciousness that arises during this stage. An electroencephalogram (EEG) recording of a person in the REM sleep stage resembles that of a person who is awake.
During sleep, the body typically goes through several sleep cycles that last around 90 minutes on average. Each cycle alternates between two types of sleep: light sleep and deep sleep. Light sleep is the entry point into sleep each night, as the body unwinds and slows down. Deep sleep periods are usually longer earlier in the night. REM sleep periods, on the other hand, tend to be longer towards the end of the night.
Fitbit devices can track sleep patterns by estimating sleep stages based on movement and heart-rate patterns. When the device detects that the wearer has not moved for about an hour, it assumes that the person is asleep. It also uses the length of time of movements indicative of sleep behaviour, such as rolling over, to confirm the sleep status. While the user is asleep, the Fitbit tracks beat-to-beat changes in heart rate, known as heart rate variability (HRV), which fluctuate as the wearer transitions between light sleep, deep sleep, and REM sleep.
While Fitbit's sleep tracking can provide insights into sleep patterns, it is important to note that it may not always be completely accurate. Factors such as sleeping position and heart rate can affect the device's ability to accurately track sleep stages. Additionally, the accuracy of Fitbit's sleep staging is evaluated in 30-second blocks, with a reported accuracy of 69% in any given 30-second window. Therefore, using the app over multiple nights will provide a more comprehensive understanding of an individual's sleep patterns.
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Fitbit estimates sleep stages using movement and heart-rate patterns
Sleep is typically divided into two types: REM (rapid eye movement) sleep and non-REM sleep. REM sleep is associated with vivid dreams and longer periods of REM sleep tend to occur later in the night. Non-REM sleep, on the other hand, includes stages of light sleep and deep sleep, with the periods of deep sleep typically being longer earlier in the night.
Fitbit's sleep feature estimates sleep stages by using a combination of movement and heart-rate patterns. Firstly, it assumes you are asleep when you haven't moved for about an hour. Additional data, such as the length of time of movements that indicate sleep behaviour (e.g. rolling over), can also help confirm that you are asleep.
While you sleep, 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, it uses your movement and heart rate patterns to estimate your sleep cycles from the previous night.
The accuracy of Fitbit's sleep staging has been called into question, with some users questioning whether their Fitbit is confusing their REM sleep with light or awake stages. 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. While this may seem low, it is important to consider the context. If you use the app for many nights, you can get a good sense of how often you tend to be awake, lightly asleep, or deeply asleep on a typical night.
Fitbit also offers several tools to help you sleep better, such as setting a sleep schedule and bedtime reminders to help you wind down each night.
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Fitbit sleep staging is only correct in 30-second blocks slightly more than two-thirds of the time
Sleep is divided into two types: REM (rapid eye movement) sleep and non-REM (NREM) sleep. REM sleep is the stage associated with vivid dreams, and the period typically gets longer as the night progresses. Non-REM sleep, on the other hand, includes the stages of light sleep and deep sleep, with less brain activity than REM sleep.
Fitbit devices track sleep by estimating sleep stages using a combination of movement and heart-rate patterns. When the device senses that you haven't moved for about an hour, it assumes that you are asleep. Additional data, such as the length of time of movements that indicate sleep behaviour, help confirm your sleep status. While you sleep, the device 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, it is important to note that Fitbit sleep staging is only correct in 30-second blocks slightly more than two-thirds of the time. 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. This means that if you only use Fitbit for one night, you should take the app's sleep staging with a grain of salt.
While Fitbit provides valuable insights into your sleep patterns, it is not a medical device. If you have any concerns about your sleep health, it is recommended to consult a doctor. Additionally, factors such as your sleeping position and the placement of your device can affect the accuracy of heart rate readings.
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REM sleep decreases as we age
Sleep is essential to a healthy lifestyle, impacting everything from a person's daily mood to their appetite, physical activity, and chronic conditions. Sleep is a body process that allows the body to rest, repair, and restore itself. Lack of sleep has been linked to many health issues.
REM sleep, or rapid eye movement sleep, is one of the two types of sleep, the other being non-rapid eye movement (NREM) sleep. REM sleep is associated with vivid dreams, and the periods of REM sleep are typically longer towards the end of the night.
Fitbit devices estimate sleep stages by using movement and heart-rate patterns. When the user hasn't moved for about an hour, the device assumes they are asleep. While the user is asleep, the device tracks beat-to-beat changes in their heart rate, known as heart rate variability (HRV), which fluctuate as the user transitions between light sleep, deep sleep, and REM sleep.
As we age, our sleep patterns tend to change. Older people may find it harder to fall asleep and may wake up more often during the night and earlier in the morning. Total sleep time may decrease slightly, and older people may feel like lighter sleepers than when they were younger. Less time is spent in deep, dreamless sleep.
Older people should be cautious about taking sleep medicines, as they can lead to dependence or addiction and may have toxic effects if taken for a long time. Cognitive behavioral therapy can be helpful for insomnia, and mild antihistamines may work better than sleeping pills for short-term relief. Melatonin supplements are safe for short-term use and may help with falling asleep.
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REM sleep can be affected by medication and supplements
REM sleep, or rapid eye movement sleep, is one of the two types of sleep, the other being non-rapid eye movement (NREM) sleep. During REM sleep, the body experiences increased brain activity, eye movement, and muscle activity. Fitbit devices estimate sleep stages, including REM sleep, by tracking movement and heart-rate patterns.
Furthermore, certain supplements may improve REM sleep quality. Choline supplements, for example, can enhance dream prevalence and sleep quality. Vitamin B6, or pyridoxine, is another supplement that may increase serotonin and melatonin levels, affecting sleep by producing lucid dreams. Research also suggests that a combination of theanine and GABA significantly improves sleep duration and REM sleep.
Zinc supplements have been shown to improve REM sleep quality by producing more melatonin and reducing the likelihood of bad dreams. Similarly, vitamin D supplements may help regulate sleep cycles and facilitate the transition to REM sleep. However, it is important to consult a doctor before taking any supplements or medications, as they can have potential side effects and interactions.
Additionally, certain medications can impact sleep patterns and REM sleep. Antidepressants, for example, have been linked to changes in REM sleep architecture, including shortened REM sleep onset latency, increased REM density, and reduced total sleep time. If you suspect that your medication is affecting your sleep, it is important to consult your healthcare provider for guidance and possible alternatives.
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Frequently asked questions
REM stands for rapid eye movement.
Fitbit estimates sleep stages by using your movement and heart-rate patterns. When you haven't moved for about an hour, your tracker or watch assumes that you're asleep. Additional data, such as the length of time of movements that are indicative of sleep behavior (like rolling over), can also help confirm that you're asleep.
Fitbit's sleep staging is only correct in 30-second blocks slightly more than two-thirds of the time. There is also a slight overestimation of REM from sensor readings, but the Fitbit algorithm corrects for this.
If you sleep with your arm under your head or in a position that prevents your device from getting a consistent heart-rate reading, it may affect the accuracy of your sleep data.
