Drivers side Active head restraint, spontaneously deployed. Headrest hit driver in the head while driving. Which could have caused an accident had driver had their head against headrest or been traveling at a faster speed. No warning lights or tones before deployment. Vehicle has not been inspected by dealership, manufacturer or police as Vehicle was not in an accident. They will not be notified due to no recall or warranty. Part will be replaced by onwer. After further inspection plastic clips inside the headrest failed.