Gina Johnson
Fitbit's sleep tracking function can wake you up during light sleep, around the time of your alarm. The Charge 5 model has this feature, which vibrates to wake you up without a problem. However, some users have reported that the Fitbit wakes them up during REM sleep instead of light sleep. This is because it is complicated to make an accurate detection based on heartbeat, and Fitbit currently registers a movement of more than 2g on the wrist to detect light sleep.
| Characteristics | Values |
|---|---|
| Fitbit model | Charge 5 |
| How it works | Vibrates to wake you up |
| When it wakes you up | During light sleep or when you're already awake |
| When it doesn't wake you up | If you're in REM sleep or deep sleep |
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What You'll Learn
The Fitbit Charge 5 can wake you up during light sleep
The Fitbit can detect sleep stages and wake you up during light sleep, when you move. However, one user says that it is complicated to make a very accurate detection of heartbeat. The best time to wake up is just after REM sleep.
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The Fitbit Versa can wake you up during REM sleep
The Fitbit Charge 5 also has a similar feature, which wakes users up during light sleep, or REM sleep if they are still sleeping deeply enough.
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Fitbit can detect sleep stages
The Fitbit app also has a smart sleep alarm feature, which allows you to set a window of time for your alarm to go off during light sleep. However, some users have reported that the app wakes them up during REM sleep instead of light sleep, even when light sleep is detected within the window.
Fitbit's ability to detect sleep stages is based on detecting movement of more than 2g on the wrist during light sleep. While this method is not as accurate as detecting heart rate, it is still effective in determining the best time to wake up, which is just after REM sleep.
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Fitbit can detect movement of more than 2g on the wrist
The Fitbit Charge 5 can wake you up during light sleep. It vibrates to wake you up without a problem. It will also ring during light sleep, or when you are already awake. If you are still in REM sleep, it will ring later.
The Fitbit Versa can also wake you up during light sleep, but it is not as accurate. One user reported that it woke them up in REM sleep, and not light sleep.
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Fitbit can detect heartbeat
The Fitbit app has a 'smart sleep alarm' feature, which allows you to set a 'window' for when you would like to wake up. One user reported that the app woke them up during REM sleep, and not light sleep, despite registering light sleep during the window.
According to science, the best time to wake up is just after REM sleep. Fitbit has already figured out how to detect sleep stages. However, it is complicated to make a very accurate detection of heartbeat. Currently, the Fitbit registers a movement of more than 2g on the wrist.
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Frequently asked questions
Yes, the Fitbit Charge 5 can wake you up during light sleep. It vibrates to wake you up without a problem.
Fitbit can detect sleep stages and currently registers a movement of more than 2g on the wrist to detect light sleep.
According to science, the best time to wake up is just after REM sleep. However, some people report feeling better when they wake up during light sleep.
