The Do Not Disturb mode is a setting that mutes all sounds and vibrations, 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.
The Do Not Disturb mode also prevents the watch from going into hibernation after a period of inactivity. So, you can enable this setting along with Daily HR (see Daily HR) to get heart rate tracking when you wear your watch while sleeping.
To turn on the Do Not Disturb mode:
While in this mode, you can turn on the backlight and check the time by pressing any button. When the screen is on, press the upper button to turn 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.