KNOW YOUR SLEEP SCORE—Sleep score provides an easy way to help track and understand the quality of your sleep, so you can make it more restorative.EVEN MORE HEALTH INSIGHTS—Take an ECG anytime. Get notifications for a high and low heart rate, an irregular rhythm, and possible sleep apnea. View overnight health metrics with the Vitals app and take readings of your blood oxygen.STUNNING DESIGN—Thin and lightweight, Series 11 is comfortable to wear around the clock—while exercising and even when you’re sleeping, so it…