Hi, I am a doctor and recently learnt basics of opencv. I wanted to use opencv ( by analysing the video feed from a camera attached in the room) to measure the sleeping hours of a patient in my hospital - time for which the patient is awake, roaming around and time for which he sleeping on bed. There is a nurse as well moving around in the room sometimes. Can you please tell me the way in which I can solve the problem. I tried using the Zdenek Kalal's predator algorithm but its computationally heavy and I have some other analytics also running sideways. Please help me.