More about Brian X. Chen A Ring That Tracks Your Sleep: The $350 Oura Ring 4 looks sleek and cool, and it may be useful for data-hungry health enthusiasts. But it failed this sleep-deprived parent.
With its fashionable design, Oura’s ring doesn’t merely track your sleep, activity, heart rate and a whole bunch of health metrics, including daytime-stress, cardiovascular age and period and ...