The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular devices for tracking activity even years after its release, thanks to the balance of price, functionality and reliability. However, many users face problems when setting up sleep monitoring: data is not stored, schedules are empty, or the bracelet simply does not record sleep phases. In this article, we will analyze step-by-step settings through official applications (Mi Fit and Zepp Life), explain how sleep analysis algorithms work, and reveal a hidden feature of manual editing of sleep periods that is not written in standard instructions.
It's important to understand that the Mi Band 4 uses a combination of accelerometer and machine learning algorithms to determine sleep phases (light, deep, REM). But the accuracy depends not only on the hardware, but also on the correct settings in the accompanying software. If you've previously tried to turn on monitoring but received incorrect data, the problem is probably one of three key parameters: energy saving mode, application synchronization, or the physical position of the wristband on your hand.
1. bracelet preparation: checking firmware version and compatibility
Before setting up sleep monitoring, make sure your Mi Band 4 runs on the current firmware version.Odd software can cause data collection failures, especially if you use the Zepp Life app (formerly Mi Fit).
To check the firmware version:
- Open the Mi Fit or Zepp Life app.
- Go to Profile. → Mi Smart Band 4 → About the device.
- Find the firmware version line. Current for 2026, 1.0.9.54 and higher.
If the version is outdated, update it through the same menu. Importantly, during the update, do not disconnect the bracelet from the phone or close the application. It will take 2-5 minutes.
2. Step-by-step setup of sleep monitoring via Mi Fit
The official Mi Fit app (or its successor, Zepp Life) offers two ways to enable sleep tracking: automatic and manual.
Method 1: Automatic mode (recommended)
This method allows the bracelet to determine when you are sleeping based on your hand movements.
- 📱 Open Mi Fit and go to Profile → Mi Smart Band 4 → Sleep monitoring.
- 🔄 Activate the slider Automatic sleep detection.
- ⏰ Set an alarm (optional) in the section Smart alarm for a smooth awakening.
- 🔒 Save settings and sync the bracelet (shake it or press the screen to speed up the process).
Method 2: Manual mode (for precise fixation)
If automatic mode misses periods of sleep (for example, when sleeping inactively), use manual control:
- 🛌 Before going to bed, click on the bracelet screen and select the Dream icon (crescent moon).
- ☑️ Confirm the start of tracking (the bracelet vibrates).
- 🕒 After waking up, re-click on the screen and select End the Sleep.
Automatic mode activated in Mi Fit
The bracelet fits tightly to the wrist (2-3 fingers above the bone)
Bluetooth on your phone
The data synchronization was successful (check the notification in Mi Fit).
-->
Note: In manual mode, the bracelet only records sleep between your taps. If you forget to end the session, the data may be inaccurate.
Setup through Zepp Life: Differences and Hidden Features
The Zepp Life app (formerly Amazfit) offers enhanced sleep analysis capabilities compared to Mi Fit. It provides detailed sleep phase graphs, rest quality assessments, and even recommendations for improvement.
To enable monitoring in Zepp Life:
- Open the app and go to Devices → Mi Band 4 → Sleep settings.
- Activate options: 🌙 Auto-detection of sleep 📊 Detailed phase analysis (requires the last firmware) 🔔 Smart alarm clock (optional)
Sensitivity
Tall.
Hidden feature: In Zepp Life, you can manually edit your sleep periods if the bracelet is wrong.
- Open your sleep diary on the right date.
- Click on the three dots in the top right corner and select Edit.
- Adjust the time of the beginning and end of sleep.
Why does Zepp Life show more data than Mi Fit?
4. Frequent errors and their solutions
Even with the right settings, users face problems.-5 errors and ways of eliminating them:
| Problem. | Possible cause | Decision |
|---|---|---|
| The bracelet doesn't record sleep. | Automatic mode or weak fit to the hand is disabled | Check the settings in Mi Fit/Zepp Life and tighten the strap |
| Sleep data disappears after synchronization | Application failure or interrupted synchronization | Reboot the bracelet (hold the 10 sec button) and sync again |
| Shows "daytime sleep" instead of night sleep | Incorrect time on a bracelet or phone | Synchronize time in device settings |
| Sleep schedule is blank, but the bracelet vibrates at night | Conflict with another fitness app (Google Fit, Apple Health) | Disable integration with third-party services in Mi Fit |
⚠️ Warning: If after all the manipulations, the bracelet still does not track sleep, check the energy saving mode in the phone battery settings. Some manufacturers (for example, Xiaomi, Huawei) block the background work of the Mi Fit, which leads to data loss.
5. Optimizing accuracy: tips from experts
The accuracy of monitoring sleep on the Mi Band 4 depends on several factors, and this is what experts recommend.
- 📵 Wear the bracelet on your non-working hand (left for right-handed, right for left-handed) and this reduces the number of false positives from movement.
- 🔋 Charge the bracelet to 100% before bedtime.At a charge level below 20%, the device can turn off the sensors to save energy.
- 🛏️ Sleep in the same position for the first 10-15 minutes, and the bracelet takes time to "realize" that you are asleep.
- 📱 Keep your phone close (within 10 meters) Although the bracelet collects data autonomously, a stable connection is required to synchronize correctly.
💡
If you sleep with a partner who also wears a fitness bracelet, place the devices 30+cm apart, otherwise the sensors can create mutual interference by distorting the data.
For maximum accuracy, combine automatic and manual modes: turn on manual tracking before bedtime, but leave active and automatic mode in case you forget to finish the session.
6.Mi Band 5/6 comparison: what's changed?
If you’re considering an upgrade, it’s helpful to know how sleep monitoring has evolved in new models:
| Characteristics | Mi Band 4 | Mi Band 5 | Mi Band 6 |
|---|---|---|---|
| Heart rate sensor | ❌ No. | ✅ Yes (optional for sleep) | ✅ Aye (automatically) |
| REM-phase | ❌ No data. | ✅ Yes (in Zepp Life) | ✅ Aye (with detail) |
| Daytime naps | ✅ Fixing. | ✅ Fixing. + analysis | ✅ Fixing. + recommendations |
| precision | 70–75% | 80–85% | 85–90% |
Mi Band 4 remains relevant for basic tracking, but if you are interested in REM phases or monitoring heart rate in your sleep, consider upgrading to Mi Band 6 or later.
7.Alternative applications for sleep analysis
If the standard Mi Fit/Zepp Life apps do not suit you, you can use third-party services:
- 📊 Sleep as Android: Integrates with Mi Band 4 via the plugin and offers advanced statistics including snoring recording (requires phone microphone).
- 🌙 Pillow: automatically imports data from the bracelet and builds graphs with recommendations (paid for iOS).
- 🔍 Google Fit: Aggregates data from Mi Fit, but without detailing sleep phases.
⚠️ Warning: Third-party apps can reduce battery life of the Mi Band 4 by 20-30%, as they require constant synchronization.
💡
Combine data with the Mi Band 4 and your smartphone (e.g., through Sleep as Android) to correlate your hand movements with sound patterns (snoring, sleeping).