Never miss a beat. With the ECG app, Apple Watch is capable of generating an ECG similar to a single-lead electrocardiogram.2 And the Heart Rate app alerts you of high and low heart rates, as well as irregular rhythm.3 You snooze. You win. Set up a bedtime routine and track your sleep. See the time you spent in REM, Core, and Deep sleep, as well as when you might have woken up. And get notified if