Where has this iPhone hack been all our lives? This one is a true battery saver for anyone who loves falling asleep to music or sounds. It has even been known to stop arguments between partners who don't like hearing the other one's music all night. The reason you've probably never stumbled upon this trick is because it's hidden within timer settings, not music settings.
To set up this genius functionality, you'll need to open up the clock app and select timer in the bottom right corner. Select the duration of your bedtime music session and then tap on the 'when timer ends' menu. Default is usually the 'radar' alarm sound, but simply change this to 'stop playing' and tap 'set' in the top right corner. Now you can press 'start' and enjoy the tunes!