The Do not disturb mode is a setting that mutes all sounds and vibrations and dims the screen, making it a very useful option when wearing the watch in, for example, a theater or any environment where you want the watch to operate as usual, but silently.
To turn on/off the Do not disturb mode:
If you have an alarm set, it sounds as normal and disables Do not disturb mode unless you snooze the alarm.
You can define Do not disturb settings in the Focus mode menu in the watch settings.
Toggle on the During sleep option to automatically turn Do not disturb on during the previously defined sleep hours.
You can also set any other schedule for automatically activating the Do not disturb mode according to your needs.