Xiaomi Smart Watch Sleep Mode: How to Turn On, Configure and Check Accuracy

Xiaomi’s smartwatches have long since ceased to be just a time-tracking accessory, becoming full-fledged health-care assistants. One of the key features that users buy fitness bracelets and smartwatches for is sleep monitoring. However, not everyone knows that this option requires the right setup on the device itself and in the accompanying app to work properly.

In this article, we will discuss how to turn on sleep mode on different Xiaomi models (from Mi Band 3 to Xiaomi Watch 2 Pro), what parameters affect the accuracy of measurements, and what to do if the watch does not record sleep at all. Particular attention will be paid to common errors that cause data to be distorted, for example, when the device considers reading a book before bedtime “wakefulness”, and a slight nap on the couch – “deep sleep”.

If you’ve just bought a gadget or used it for a long time, but have never delved into your sleep settings, this guide will help you understand all the nuances. We will also compare how different versions of firmware and applications (Mi Fit, Zepp Life) work, and give recommendations for optimizing the battery during round-the-clock monitoring.

What Xiaomi models support sleep tracking?

Not all Xiaomi smartwatches are equally good at monitoring sleep, but the functionality depends on the firmware version, the type of sensors, and even what app you use to sync.

If your model didn’t make it to the table, check its specs on Xiaomi’s official website. For example, the Mi Band 2 and older versions do not support automatic sleep monitoring – you need to manually activate the mode before going to bed. In new devices (starting with the Mi Band 5), the function works continuously, but it can still be turned off to save charge.

Also, look at the firmware version. For example, Mi Band 6, after upgrading to 1.0.6.54, has an option to track daytime sleep that was not available in the earlier versions. → About the device → Firmware update.

How to turn on sleep mode in different models

The process of activating sleep monitoring depends on the type of device and application used, and below are the universal instructions for the most popular gadgets.

For the Mi Band. 3/4 (manual)

On older Xiaomi fitness bracelets, there is no automatic sleep tracking, and you will have to manually turn on the mode every night:

1. Swipe your finger up or down the bracelet screen to open the menu.
2. Find the icon "More" (three dots) → "Sleep regimen".
3. Tap the icon to activate mode. The crescent icon will appear on the screen.
4. After waking up, repeat the action to get out of the mode.

If you forget to turn off your sleep in the morning, the bracelet will continue to record sleep even when you are awake, which will distort the statistics in the Mi Fit app.

For the Mi Band. 5/6/7 Xiaomi Watch (Automatic Mode)

In the newer models, sleep monitoring works by default, but it can be configured or turned off.

1. Open the Mi Fit or Zepp Life app on your smartphone.
2. Go to the "Profile" section" → Choose your device.
3. Find the tab "Sleep Monitoring" or "Modes".
4. Activate options: 🌙 Automatic sleep tracking (recommended) 📊 Sleep phase analysis (deep/light)/REM) 🔋 Battery optimization (reduces the frequency of measurements at night)

Save.

Update

The Xiaomi Watch 2 Pro also has a Smart Sleep Mode option that adapts the measurement frequency to your schedule, for example, if you go to bed at the same time, the watch will spend less energy monitoring in the “normal” hours.

Make sure the bracelet fits tightly to the wrist (gap no more than 1 cm)

Update the device to the latest version

Enable notifications from the Mi app Fit/Zepp Life

Turn off the "Do Not Disturb" mode during sleep (if you need to track wake-ups)

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Through the Zepp Life app (for Watch) S1/S2)

The Zepp Life app (formerly Amazfit) offers more detailed sleep analytics than Mi Fit.

1. Open Zepp Life. → "The device" → "Sleep monitoring".
2. Turn on the options: 🌙 Auto-tracking 📈 Detailed analysis (shows charts of heart rate and oxygen in the blood) 🛌 Reminder of sleep (wakes up in the optimal phase)

Sleep settings

routine

Important: If you use both apps (Mi Fit and Zepp Life) at the same time, sleep data may be duplicated or conflicted, and we recommend choosing one and untie the device from the other.

Why Xiaomi Watches Don't Record Sleep: Common Problems

Even when properly tuned, sleep monitoring may not work properly, and here are the most common causes and ways to address them:

• 🔋 Weak battery power: If the charge level is below 20%, the bracelet automatically turns off energy-intensive functions, including sleep sensors. Solution: charge the device before bedtime to 50% or higher.
• 🤖 Older versions of software have worse sleep recognition algorithms. Solution: Update the firmware through Settings → About the device → Update.
• 📱 No sync with your phone. If you lose communication with the app, the data may not be saved. Solution: check Bluetooth and Mi permissions Fit/Zepp Life.
• 🛏️ The sensors must fit tightly to the skin, but not to the wrist. Solution: tighten the strap so that one finger passes between the skin and the body.
• ⏰ Irregular schedule. If you go to bed at different times, the algorithms may get confused. Solution: manually specify approximate sleep time in the app settings.

Another common problem is when the clock detects false awakenings, for example, if you turn in your sleep or scratch your nose, the device may consider it an "awakening."

1. Open the app and check your sleep schedule overnight.
2. If you see many short awakenings (1-2 minutes) that don’t match reality, reduce the sensitivity of the sensors in the settings.
3. In Zepp Life, this is done in the Device Settings section. → Sleep sensitivity".

Sometimes users are faced with the opposite situation: the watch records sleep when it was not there, for example, if you are lying on the couch with a book or watching a movie, this is because the motion sensors (accelerometer) register low activity, to avoid false positives:

• Turn on the "Night Only" option (ignores daytime inactivity) in the settings.
• Use the manual mode (activate sleep only before you go to bed).

How to Check the Accuracy of Sleep Data

Xiaomi's algorithms are not perfect, and sometimes their performance is at odds with reality. To assess the accuracy of monitoring, compare the clock data with your subjective sensations or other devices (for example, polysomnography, if you have been tested).

• ⏱️ Total sleep duration. If the clock is 4 hours and you're 7-8, they've missed phases.
• 🌌 Phase ratio: Normally, deep sleep takes 15 to 25 percent of total time, REM-Sleep is 20 to 25 percent. If these numbers are very different, maybe the sensors are misinterpreting the signals.
• 💤 1–2 awakenings per night is normal, but if the clock is 10+ Micro-awakenings are more likely to respond to random movements.

For a more objective assessment, you can use the test mode:

1. Lie in bed and turn on the clock sleep mode.
2. Keep a time on your phone and try not to move for 10-15 minutes (by simulating a dream).
3. Check if the clock has recorded this period as sleep, and if not, the problem is sensors or settings.

The Zepp Life app has a sleep quality score (0 to 100) that takes into account:

• Duration of deep sleep.
• Frequency of awakenings.
• Blood oxygen levels (SpO₂).
• Average heart rate (HR) during sleep.

If your score is consistently below 60, it's a good idea to review your daily routine or see a doctor, but remember that a smartwatch is not a substitute for medical diagnosis, it's a recommendation.

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To improve monitoring accuracy, drink a glass of water before bed and lie on your back for 5 minutes, which stabilizes heart rate and helps sensors better determine the onset of sleep.

Set up notifications and alarm clocks by sleep phases

One of the most useful features of Xiaomi smartwatches is the Smart Alarm, which will wake you up in the optimal sleep phase, which helps you wake up alert even if you slept less than usual.

1. Open the Mi Fit or Zepp Life app.
2. Go to the "Alarm clock" section" → "Smart alarm clock".
3. Specify the desired waking time (e.g. 7:00).
4. Set the interval for a "smart" awakening (usually 30 minutes), and the clock will wake you up during this window when you have a light sleep phase.
5. Activate the option "Vibration" or "Sound signal" (optional).

Important: The smart alarm only works when sleep monitoring is on, and if you turn off this function to save battery life, the alarm goes off at the exact time.

You can also set up sleep reminders:

• 🛌 In Zepp Life: "Profile → Reminders → Sleep time. Indicate when you need to go to bed to get enough sleep.
• 📵 In Mi Fit: “The device → Reminders → Sleep mode. You can set a schedule here and turn on "do not disturb" for the night.

If you use the Xiaomi Watch 2 Pro, there is an option called “Bedtime Stress Analysis,” which measures stress levels 1-2 hours before departure and advises relaxation techniques (breathing exercises, meditation).

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A smart alarm clock works better if you go to bed at the same time, and algorithms learn from your habits and determine sleep phases more accurately.

How to save battery during round-the-clock monitoring

Continuous sleep tracking consumes additional energy, especially if all sensors are on (HRC, SpO₂, To prevent the bracelet or watch from running out overnight, follow these tips:

• 🔋 Turn off unnecessary sensors, for example, if you don't need blood oxygen monitoring (SpO₂), Deactivate it in the settings.
• 📶 Reduce synchronization frequency. Mi Fit allows you to update data every 30 minutes instead of the constant one.
• 🌙 Use the "Economic Sleep Mode" (available in Xiaomi Watch) S2 It reduces the frequency of sensor surveys, but it retains basic data.
• 🔄 Turn off automatic synchronization and update data manually in the morning.

The table below shows the approximate battery consumption for different monitoring settings (for Mi Band 7):

If you notice that the bracelet is discharged too quickly, check which apps have access to its data. For example, some fitness trackers (like Google Fit) can constantly poll the device, which increases battery consumption.

For the Xiaomi Watch 2 Pro, there is a separate “Battery Adaptive Mode” setting that automatically reduces power consumption at night if the charge level is below 30%.

1. On the clock, go to Settings. → Battery.
2. Select "Adaptive Mode".
3. Activate the “Optimize at Night” option.

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If you forgot to charge your bracelet at night but want to track your sleep, turn on Economy mode and turn off all notifications, which will extend the work by 1-2 days.

Comparison of applications: Mi Fit vs Zepp Life

Until 2021, all Xiaomi smartwatches were customized through the Mi Fit app. However, after the rebranding, many models (especially the Xiaomi Watch) switched to the Zepp Life (formerly Amazfit).

• 📊 Sleep analytics: Mi Fit: basic graphs, no phase detail. Zepp Life: advanced statistics, tips for improving sleep, integration with the PAI (personalized).
• ⚙️ Settings: Mi Fit: simple interface, fewer options. Zepp Life: more parameters (sensor sensitivity, heart rate calibration).
• 🔔 Notifications: Mi Fit: standard alerts. Zepp Life: you can adjust the vibration for different phases of sleep (for example, a light awakening in the sleep). REM-phase).

Which option should I choose?

• If you have Mi Band 3-7, Mi Fit is enough – there are all the necessary functions.
• If you have a Xiaomi Watch S1/S2 watch 2 Pro, better use Zepp Life – it unlocks the full potential of the device.
• If you want the most detailed analytics, try both apps and compare the data.

Important: don't connect the same watch to two apps at the same time, and this will lead to data conflict and synchronization errors, so if you decide to change Mi Fit to Zepp Life, remove the device from the first application first.

Zepp Life has a unique feature called Sleep Comparison, which shows how your sleep differs from the average of people of your age and gender, for example, if you sleep 2 hours less than normal, the app will suggest adjusting your schedule.

FAQ: Frequent questions about sleep on Xiaomi