A common problem in alarm apps is that it does not silence the device between set and triggered time. Nap Time Alarm is a great example of how to activate Do Not Disturb mode once alarm is set. Although it's now a full blown countdown or alarm app, the backend uses Firebase authentication and Realtime database to store user's last recorded minutes and seconds. Sign-in to Google account is optional. - App needs Do Not Disturb access for Android >= 23 Marshmallow - Source at https://github.com/hi