An electronic device for monitoring the behavior of a driver is adapted to be carried on board a vehicle and to be connected to a sensor of at least one image of the driver's head and to at least one light source positioned within a passenger compartment of the vehicle. The monitoring device includes: a module for detecting abnormal behavior of the driver, from at least one image of his head acquired by the image sensor(s); a stimulation module configured, following the detection of said abnormal behavior, to command the emission of at least one light signal by switching on at least one respective light source according to an initial stimulation level; and a module for evaluating a reaction of the driver, on the basis of at least one image of the driver's head following the emission of the light signal(s).