Buy It Now: Free, Apple App Store; Google Play Store

When you're lying in bed at night trying to catch some sleep, it's easy to become distracted by all the noises you wouldn't normally notice during the day. The beeps of electronics, the sound of car engines zooming down the street, or the bark of a dog from a few doors down-all of it can end up keeping you from falling asleep. With the White Noise app, you control your room's ambiant sounds and use them to drown out everything else. The app comes with 40 looping sounds like cats purring, ocean waves crashing, or the white noise of a television. Just enough noise to bring you some peace.