Whether you're trying to sleep or in the middle of a job interview, your Android phone always makes noise at the most inappropriate time. Not a fan of incessant chimes or hearing your phone scream "Droid" like some kind of killer robot? It's easy to teach your device some manners.
You can go into each individual app and try to disable its notification sounds, but no matter how many you turn off, there's always one more service ready to come out of nowhere and make noise when you least expect it. The solution is not disable Android notifications piece by piece, but to choose a slient audio file as your default sound.