If the "Do Not Disturb" mode on the LG device is turned on according to a schedule, the alarm clock can automatically deactivate it even if the end of the mode is after the alarm time.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound
Step 3:  Tap on  Do not disturb
Step 4:  Tap on desired  Schedule
Step 5:  Enable or Disable  End if alarm rings
  1. Open the Settings
  2. Tap on Sound
  3. Tap on Do not disturb
  4. Tap on desired Schedule
  5. Enable or Disable End if alarm rings

LG Instructions
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