The Xiaomi Mi Band series is an affordable fitness tracker that can monitor daily activity and health metrics such as blood oxygen levels, stress, and sleep patterns. The Mi Band 2 is a popular model that can track sleep using a built-in accelerometer to detect motion and a heart rate sensor to estimate when you fall asleep. To get started with sleep tracking on the Mi Band 2, users can enable the sleep assistance option and adjust settings in the Mi Fit app. Third-party apps such as Sleep as Android and Zepp Life can also be used to view and analyze sleep data. While the Mi Band 2 provides valuable insights into sleep patterns, it may not offer the same in-depth sleep analysis as dedicated sleep tracking devices.
| Characteristics | Values |
|---|---|
| Sleep tracking accuracy | 70% to 78% |
| Sleep breathing quality | Mi Band models with blood oxygen sensors can monitor breathing quality |
| Sleep quality analysis | Provides snippets explaining that you didn’t get enough sleep or that your sleep quality was worse than usual |
| Sleep regularity | Displays your previous night’s sleep compared to the last week’s trend |
| Sleep assistance | Measurements seem correct, but the "awake time" is always 0 even when the user has woken up several times in the night |
| Heart rate monitoring | Can be enabled in Sleep as Android: Settings > Wearables > Heart rate monitoring |
| Sleep data sync | Requires manually opening the Fit app after the band syncs the sleep data in the morning |
| Sleep tracking | Uses a built-in accelerometer to detect motion and a heart rate sensor to estimate when you fall asleep |
| Sleep tracking app | Zepp Life is recommended over Xiaomi Wear for its display of health information |
| Sleep tracking capabilities | Tracks sleep duration, asleep and wake times, blood oxygen levels, stress, and the hours and minutes spent asleep |
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What You'll Learn

Activating sleep assistance
The Xiaomi Mi Band series is an affordable and versatile option for tracking your sleep. The Mi Band uses a built-in accelerometer to detect motion and a heart rate sensor to estimate when you fall asleep. The sleep tracker on the Mi Band is turned off by default to save battery life, so you will need to activate it.
- Download the Mi Fit app and pair it with your Mi Band 2.
- In the Mi Fit app, enable the "Lift wrist to view info" option. This allows for motion detection and heart rate tracking.
- Open the Zepp Life app and tap on the Profile tab.
- Select your Mi Band 2 device under the "My Devices" section.
- Tap on "Health Monitoring".
- Toggle on "Assisted Sleep Monitoring" under the Heart Rate section. This will increase the heart rate measurement frequency when the Mi Band detects you are asleep, providing more detailed data.
Additionally, if you want to integrate your Mi Band 2 with other sleep tracking apps, such as "Sleep as Android", you will need to purchase and download additional tools, such as "Tools & Mi Band". You will also need to enable heart rate monitoring in the app's settings and set the interval at which you want your heart rate to be measured during sleep.
Remember that the Mi Band's sleep tracking accuracy is around 70% to 75%, so while it can provide valuable insights into your sleep patterns, it may not be able to differentiate between different stages of sleep accurately.
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Syncing sleep data with Google Fit
The Mi Fit app has been criticised for its limited functionality and oddly worded analyses of sleep and step tracking. It also doesn't display total calories burned in a day, week, or month. For these reasons, you may want to sync your Mi Band 2 sleep data with Google Fit, which has a more polished interface and syncs easily from Mi Fit.
To start, open the Mi Fit app and tap the profile button on the lower right corner. This will take you to an overview of your account, the devices that you have paired with Mi Fit, and other settings you can adjust.
From here, you can sync your Mi Band 2 sleep data with Google Fit. However, it's worth noting that some users have reported issues with getting their sleep data to sync properly with Google Fit. For example, one user reported that their Mi Band 2 only showed sound recordings in the morning, while the activity and sleep phases were empty. Another user reported that their Mi Band 9 constantly vibrated and asked if their workout was finished while they were running.
If you encounter issues with syncing your Mi Band 2 sleep data to Google Fit, you may want to try alternative third-party apps such as Sleep as Android, Notify for Mi Band, Mi Band Tools, or Zepp Life. These apps offer features such as sleep tracking, step counting, and heart rate monitoring, and can also be synced with Google Fit to consolidate your health data in one place.
Remember that you can always go back to the "Add Accounts" setting on the Mi Fit app and remove the connection with Google Fit if you decide to try a different third-party app or stop using Google Fit altogether.
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Using the Mi Fit app
The Xiaomi Mi Band series is an affordable fitness tracker that can track daily activity and health metrics like blood oxygen levels, stress, and sleep. The Mi Band line tracks several sleep metrics, including sleep duration, sleep and wake times, and sleep breathing quality.
To use the Mi Band 2 sleep tracker, you will need to download the Mi Fit app. In the Mi Fit app, you can enable the "Lift wrist to view info" option, which will allow you to view your sleep data by simply lifting your wrist. You can also adjust the heart rate monitoring interval in the app, which will affect the frequency of measurements during sleep tracking.
It is important to note that the sleep tracker on the Mi Band is turned off by default to save battery life, so you will need to switch it on in the Mi Fit app when you want to use it. Additionally, make sure to enable the "sleep assistance" option in the app to ensure that your sleep data is being tracked.
To get a breathing quality score and blood oxygen saturation information during sleep, you will need to enable assisted sleep monitoring. This can be done by opening the Zepp Life app, tapping on the Profile tab, selecting your Mi Band device, tapping Health monitoring, and then toggling on Assisted sleep monitoring under the Heart rate section.
While the Mi Band sleep tracker is not 100% accurate, it can still provide valuable insights into your sleep patterns and help you understand your sleeping habits better.
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Improving sleep tracking accuracy
Another way to improve accuracy is to manually sync your sleep data with apps like Google Fit or Mi Fit. While steps and activity data sync automatically, sleep data often requires manually opening the app to sync. This extra step ensures that your sleep data is reliably stored and accessible for review.
Additionally, it's important to understand the limitations of sleep tracking technology. The Mi Band 2 may not always accurately differentiate between light sleep and awake time, especially if you toss and turn without getting up. Comparing the band's data with your own observations can help you identify any discrepancies and calculate a personal error percentage. Over time, you can learn to interpret the data with this error percentage in mind, focusing on general trends rather than spot accuracy.
For a more comprehensive analysis of your sleep, consider using a dedicated sleep tracking app like Zepp Life. This app provides valuable insights into your sleep quality, regularity, and breathing. It also offers suggestions for improving your sleep, helping you make specific adjustments to your sleep routine based on the data.
Finally, the Mi Band 2 may not capture every brief period of wakefulness during the night. If you find yourself occasionally waking up for a few minutes, try moving with more intensity to increase the chances of the band registering these moments as awake time. Despite these limitations, the Mi Band 2 can still provide valuable insights into your sleep patterns, allowing you to make informed decisions to improve your sleep quality.
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Heart rate monitoring
The Xiaomi Mi Band 2 is a simple device that can track your sleep, heart rate, and daily activity. The device has a built-in accelerometer to detect motion and a heart rate monitor to estimate when you fall asleep. The Mi Band 2 can also monitor your sleep cycle, including deep and light sleep, and how much time you spend in each sleep stage.
To use the heart rate monitoring feature, you must first ensure that the band is snug on your wrist. This is important because if the band is too loose, it will not be able to accurately detect your heart rate. Once you have adjusted the band, you can activate the sleep assistant feature in the Mi Fit app. This will allow the band to start tracking your sleep cycle, including your heart rate.
You can also increase the heart rate measurement frequency by enabling Assisted Sleep Monitoring. To do this, open the Zepp Life app, tap the Profile tab, and select your Mi Band device under the My Devices section. Then, tap Health Monitoring and toggle on Assisted Sleep Monitoring under the Heart Rate section. This is especially useful if your heart rate monitoring interval is set to more than five minutes.
Additionally, you can set the interval at which you want your heart rate to be measured. Go to Tools & Mi Band > Navigation Drawer > Heart Rate > Settings and set your preferred interval. This will send your heart rate data to Sleep as Android at the selected rate during sleep tracking. However, keep in mind that you also need to enable heart rate monitoring in Sleep as Android: go to Settings > Wearables > Heart Rate Monitoring and enable it.
The Mi Band 2 is a useful tool for monitoring your sleep and heart rate, but it is important to remember that it may not be 100% accurate. All fitness trackers have a margin of error, so it is recommended to focus on general trends over time rather than spot accuracy.
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