Buckle Up, Fitbit Fans: The New Smartwatch Has All the Features You've Been Dreaming Of

The Ionic features sleep stages and insights, as well as guided breathing. Because you don't have to charge the Ionic every night, you can take advantage of the tracking technology that automatically senses when you're in light, deep, and REM sleep — then delivers personal insights and can even go so far as to determine if you have sleep apnea.