Bedtime, available as part of your Clock app on Apple devices, is a simple twist on the standard alarm clock. It will lull you out of sleep with a peaceful tone and lets you set an exact time for rising. You can select which days of the week you want your alarm to go off (weekdays only, weekends only, etc.). Choose how many hours you want to sleep, and the app will tell you when to head to bed to wake up on time. It will also give you a push notification before your bedtime.