If the Redmi Smart Band 2 doesn't record sleeping data or the sleeping data is not accurate, please refer to the following steps:
1. Please confirm your sleep period. Sleep time that is too short (less than 20 minutes) will result in no sleep data being recorded;
2. If the band is worn too loosely or shakes significantly, it will cause abnormal sleep monitoring during sleep. It is recommended that you wear your device steadily while sleeping;
3. If you fall asleep while riding in a vehicle, your sleep data will not be recorded due to bumps in the vehicle;
4. If the band is in a relatively quiet state that is similar to the sleeping scene, the sensor may be judged to be sleeping, resulting in errors in the time to fall asleep;
5. Ensure that the heart rate monitoring feature is not turned off by opening the Mi Fitness app and going to [Device] >> [Heart rate] >> [Continuously monitoring];
6. Please try to temporarily unbind the bracelet from the app. After rebinding, turn on auxiliary sleep monitoring and see if the problem is improved;
7. Please check if the device’s firmware is updated to the latest version by opening the Mi Fitness app and going to [Device] >> [Update];
8. Please ensure the Mi Fitness app is updated to the latest version by opening the Mi Fitness app and going to [Profile] >> [Version];
9. Please check that you have selected the correct region by opening the Mi Fitness app and going to [Profile] >> [Settings] >> [Region]. In the meanwhile, make sure that the region on your smartphone is the same one as your band’s;
10. Please reinstall the app and see if the issue persists;
11. Please restore the band to the factory setting by entering the main interface of the band and sliding up from the screen >> [Settings] >> [System] >> [Factory Reset].
We hope the above information is helpful. If the issue still occurs, please reconnect the band, please open the Mi Fitness app, and go to [Profile] >> [Feedback] >> [Other]. After submitting the user feedback, please have some patience and wait for future updates.