You’re trying to get a little shut eye when the phone rings and your eye’s stay popped open all night long. Of course you could shut the phone off but what happens if an emergency call needs to be heard? The “DO NOT DISTURB APP” is the only app that will send a text message to those that are calling as soon as the phone would ring with a message such as “Please note sleeping but if an emergency please press 1”. If the said individual presses 1 then you’re phone will ring. You can also block this person if they don’t know the difference between an emergency and a little more attention. The “DO NOT DISTURB APP” because you need your rest too unless you truly need to be awake.