Fuente: Wipo "Sensorization" Apparatus and methods are described, including apparatus (500d) for use with a subject (12) who shares a bed (37) with a second person (502). A motion sensor (30) detects motion of the subject (12) and motion of the second person (502), and generates a motion signal (504) in response thereto. A control unit (14) analyzes the motion signal (504), in response thereto, identifies an effect of large body-movement of the second person (502) on sleep of the subject (12), and in response thereto, generates a sleep-disturbance output (516). Other applications are also described.