Abstract: One embodiment provides a sensor module for patient monitoring. The sensor module includes a processor circuitry; a memory circuitry; at least one time of flight (TOF) sensor; a TOF logic; and a monitor logic. The TOF logic is configured to determine a sequence of elevation maps of at least a portion of a patient room. The TOF logic is further configured to at least one of a distance vector and a velocity vector associated with a selected room occupant based, at least in part, on a plurality of elevation maps in the sequence of elevation maps. Each elevation map is determined based, at least in part, on a respective TOF data set captured from the at least one TOF sensor. Each TOF data set is captured, periodically at a time interval. The monitor logic is configured to classify an activity of the selected room occupant as acceptable or unacceptable. The classifying is based, at least in part, on the at least one of the distance vector and the velocity vector.