Bedtime reimagines the alarm clock. Enter how much sleep you’d like to get, and it brings up this circular chart that lets you visualize it. The app will send you reminders a few minutes before bedtime so you have time to settle in. One nice feature is the “night mode” theme, which makes it easier to fall asleep in the first place. By far, though, the best part of Bedtime is the new set of alarm sounds that come with it.