A system for monitoring quantitative health data of a user, the system includes a stationary sensor device for monitoring a first set of quantitative health data of the user when the user is resting in bed； and a wearable tracker for monitoring a second set of quantitative health data of the user when the user is resting； wherein the wearable tracker is worn by the user； the first set and second set are sequential in time to obtain around-the-clock monitoring of the quantitative health data of the user.
