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We can enable a bedtime mode on the Xiaomi smartphone, which will automatically mute the device and reduce screen colors. For
automatic, we can select whether the mode should be activated generally at the set sleep time or while charging in the sleep time. In addition to the selectable days, we can set whether Do Not Disturb and/or Grayscale should be activated.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Digital Wellbeing & parental controls
Step 3:  Tap on  Bedtime mode
Step 4:  Choose  Based on schedule  or  While charging at bedtime
  1. Open the Settings
  2. Tap on Digital Wellbeing & parental controls
  3. Tap on Bedtime mode
  4. Choose Based on schedule or While charging at bedtime

Xiaomi Instructions