How to: Go to Settings > Display on your Android phone. There, you'll find the option to switch between a light and dark theme and to have dark mode turn on automatically at a certain time of day. I ...

If you're comfortable tweaking advanced settings, you can turn this feature off in a special hidden menu called Developer Options. To reveal the menu, go to Settings > About Phone and tap Build Number ...

Spotify has a sleep timer feature in the mobile app that will automatically turn off your music after a set amount of time.