Health Watch | Sleep trackers: Boon or bane

For many young professionals, the first thing they check in the morning is no longer the time—it is the sleep score on their smart watches. The shift reflects a growing awareness that sleep is as important to health as diet and exercise. People now want to know how well they slept and wearables promise to answer that question by tracking everything, from deep sleep and REM sleep to resting heart rate, blood oxygen levels, heart rate variability (HRV) and recovery or “readiness” scores.