Sensor can be configured to detection cycle limb motion in sleeper. Sensor can be contact sensor, such as radar motion sensors. Sensor may include radiofrequency launcher for emitting radiofrequency signal to people. Sensor may include receiver, for receiving the radiofrequency signal of the radiofrequency signal for some transmittings reflected and some transmittings of processing reflection to generate motor message (s). Processor, such as one integrate or be connected to sensor, it can be estimated that motor message, such as with mutually and orthogonal motion signal, and indicator is generated to identify motor message of the motor message based on assessment of generating period limb motion.
