In a first-of-its-kind study, researchers from Tel Aviv University and the Academic College of Tel Aviv-Yaffo used smart watches and a dedicated app to monitor 169 subjects before and during Israel’s second COVID-19 lockdown (October 2020). The watches and app provided the researchers with accurate daily data for measuring quality of life parameters, such as mood, stress, duration and quality of sleep, heart rate at rest, meeting others and physical exercise.