To make music shut off after a while when falling asleep, set a timer in the Clock app and select "Stop Playing" at the bottom of the When Timer Ends menu.
This works for all apps using the iPhone player.
Set music to stop automatically when you fall asleep
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Close multiple apps at once in the App Switcher
Open the App Switcher and use multiple fingers to swipe several apps away together.
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8 Useful iPhone Features and Tips You Should Try
Helpful iPhone features including sleep timer, measure app, music volume boost, and location shortcuts