Platform: iOS; $2

It’s easy to disregard this vital part of the day, but a good night’s rest is an integral part of daily success and basic function. Sleep Cycle won’t put you to bed, but it will help you understand what’s happening once you’re in REM. It monitors your sleep through the night and according to the site wakes you up with a 30-minute alarm window, which ends at your set alarm time and wakes you in your lightest sleep phase.