Colin Snow
Fitbit's sleep alarm is a feature that allows users to track their sleep and set alarms to wake up at optimal times. The sleep tracking function works by monitoring the user's heart rate, movement, and other metrics to determine the different sleep stages. This data is then used by the Smart Wake feature to wake the user during a light sleep stage within a 30-minute window before the set alarm time. The sleep alarm can be set up through the Alarms app on the Fitbit device or through the Fitbit app on a phone, and the user can choose to be notified by vibration or a silent alarm.
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What You'll Learn
Fitbit's silent alarm
To set a silent alarm on your Fitbit device, go to the main screen of your Fitbit and swipe left until you get to the alarm clock icon. Tap the time to set the hours and minutes, and then toggle the slider to turn on the alarm. You can also set a silent alarm through the Fitbit app by tapping on the round icon in the top left corner of the screen, then tapping "Activity and Wellness", "Sleep", and "Bedtime Reminder". You can then set the time and days of the week for your silent alarm.
The silent alarm on Fitbit devices is designed to wake you up gently, without the jarring sound of a traditional alarm clock. The alarm will vibrate on your wrist, and the device will flash when the alarm goes off. The notification will repeat several times, or until it is dismissed. If you don't dismiss the alarm, it will repeat again in 9 minutes. The alarm on most Fitbit devices will also turn off automatically after you walk 50 steps.
In addition to the silent alarm feature, Fitbit also offers a Smart Wake feature that is designed to wake you up during an optimal stage of sleep. This feature uses data from your sleep tracking to determine when you are in a light sleep stage and sets a 30-minute window before your alarm time to wake you up during this optimal stage. This can help you feel more refreshed and energised when you wake up, as waking up during deep sleep can lead to grogginess and fatigue.
It is important to note that while Fitbit devices can track your sleep stages and provide insights into your sleep quality, they are not as accurate as laboratory sleep studies that measure brain electrical activity directly. Fitbit devices use metrics such as physical movement, pulse rate, and breathing to infer your sleep stage, so the data may be less accurate. However, they can still provide valuable information about your sleep habits and help you make improvements to your sleep hygiene.
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Smart Wake feature
Fitbit's Smart Wake feature is an update that is available on newer models of Fitbit trackers. It is designed to detect the optimal time to wake you up. The system uses the fitness tracker's existing sleep profiles to determine when to trigger the alarm based on the wearer's specific sleep timing.
Smart Wake uses sleep science to determine the best time to wake the wearer. It highlights a window within 30 minutes before the user's preset alarm time and will only trigger the alarm when they are in a light sleep stage, the optimal stage from which to awaken. Waking up during deep sleep can lead to severe grogginess as it is the period during which a person is hardest to awaken, as muscles tend to relax and outside stimuli become less effective. If Smart Wake cannot find the best time to wake you, your alarm will go off at the set time.
To use the Smart Wake feature, you must first set an alarm on your Fitbit. Then, swipe left to get to the Alarm screen on your tracker. Scroll down to Smart Wake and toggle the slider. Check the time range and adjust the noise sensitivity if needed.
It is important to note that a wrist-worn sleep tracker like the Fitbit cannot measure your brain's electrical activity directly like a laboratory sleep study. Instead, it uses other metrics such as physical movement, pulse rate, and breathing to infer your sleep stage, so it may be less accurate. For best results, wear your Fitbit snugly and higher on your wrist, and ensure that your sleep position does not prevent the device from getting a consistent heart-rate reading.
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Fitbit sleep tracking functions
Fitbit's sleep tracking functions can help you get better rest, boost your energy, and improve your overall well-being. Here's how it works:
Tracking Sleep:
Fitbit devices with heart-rate tracking (excluding Fitbit Charge HR and Fitbit Surge) can monitor your sleep stages by tracking your sleeping heart rate, movement, and restlessness. This data is used to give you a personalised Sleep Score, indicating how well you slept. The device assumes you are asleep when it detects no movement for about an hour, and it tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), to determine the sleep stages you cycle through.
Smart Wake Feature:
The Smart Wake feature ensures you wake up during a light sleep stage, preventing you from being awakened during deep sleep, which can cause grogginess. It allows you to set a 30-minute window before your alarm time, and it will only trigger the alarm when you are in a light sleep stage. This feature is available on newer models of Fitbit trackers, such as the Fitbit Charge 4 and Charge 5.
Silent Alarms:
Fitbit devices offer silent alarms that gently wake you up through vibrations at your set time. You can set the alarm time and frequency, and the device will vibrate and flash when the alarm goes off. The silent alarm is particularly useful if you want to avoid disturbing others and can be easily managed through the Alarms app on your Fitbit device.
Sleep Profile:
Fitbit's Sleep Profile feature, available on select devices and requiring a Fitbit Premium subscription, provides a comprehensive understanding of your sleep style. It assigns you an animal-like avatar based on your sleep patterns and offers a monthly personalised analysis of 10 key metrics to help improve your sleep habits and quality.
Additional Features:
Fitbit's sleep tracking functions also include bedtime reminders, the ability to set sleep goals, and insights into how your sleep is related to your activity, mood, and more. The long battery life of Fitbit devices ensures you can track your sleep nightly without frequent recharging. For optimal sleep tracking results, it is recommended to wear your Fitbit snugly and higher on your wrist, towards your elbow.
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Fitbit sleep staging information
Fitbit devices with heart-rate tracking capabilities can be used to track these sleep cycles and provide a record of the sleep stages a person cycles through. The device tracks the beat-to-beat changes in the user's heart rate, known as heart rate variability (HRV), which fluctuates as the user transitions between the different sleep stages. Additionally, Fitbit devices use physical movement and breathing patterns to infer which sleep stage the user is in.
It is important to note that wrist-worn sleep trackers like Fitbit cannot directly measure brain activity in the same way that a laboratory sleep study does. Therefore, sleep experts suggest taking the sleep staging information provided by Fitbit with a grain of salt. While interesting, the data on sleep stages is less important than the total amount of sleep an individual gets.
To get the most accurate readings from a Fitbit device for sleep tracking, it is recommended to wear the device moderately snugly and higher on the wrist, about 2-3 finger widths above the wrist bone. This ensures a consistent heart rate reading and allows the device to accurately detect when the user is asleep.
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Fitbit sleep tools
Fitbit's advanced sleep tools can help you get better rest, boost your energy, and improve your well-being. The sleep tracking functions are available through the basic Fitbit app, while some features are exclusive to Fitbit Premium.
Sleep Tracking
Fitbit devices with heart-rate tracking (except Fitbit Charge HR or Fitbit Surge) can track your sleep stages. Your body typically goes through several sleep cycles that last around 90 minutes on average. Each cycle alternates between light sleep and deep sleep, with periods of rapid eye movement (REM) sleep. Fitbit estimates your sleep stages by using your movement and heart-rate patterns. When you don't move for about an hour, your tracker assumes you're asleep. It tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), to determine which sleep stage you're in.
Smart Wake
The Smart Wake feature monitors your sleep stages and wakes you during a light sleep stage within a 30-minute window before your set alarm time. This helps you avoid waking up during deep sleep, reducing grogginess and ensuring you feel more refreshed.
Silent Alarms
Fitbit devices offer silent alarms that vibrate to gently wake you up at your desired time. You can set the alarm time and frequency according to your preferences.
Sleep Profile
The Sleep Profile feature, available on select Fitbit devices and requiring a Fitbit Premium subscription, provides a comprehensive understanding of your sleep style. It offers a monthly personalized analysis of 10 key metrics to help you improve your sleep habits and quality.
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Frequently asked questions
To set a silent alarm on your Fitbit, go to the main screen of your device and swipe left until you see the alarm clock icon. Tap the time to set the hours and minutes, then toggle the slider to turn on the alarm. The alarm will vibrate when it's time to wake up.
In the Fitbit app on your phone, tap on the round icon in the top left corner of the screen. Tap "Activity and Wellness", then "Sleep", then "Bedtime Reminder". Toggle the slider for "Reminder" and set a time for your reminder, as well as the days of the week when it will be active.
The Smart Wake feature on your Fitbit monitors your sleep stages and attempts to wake you during a light sleep stage within a 30-minute window leading up to the alarm time you've set. This helps you avoid being woken up during deep sleep, so you're more likely to wake up feeling refreshed.
