THE CAR WAS PARKED IN THE DRIVEWAY. I WAS SITTING ON THE DRIVER SIDE MIDDLE SEAT, NOT SITTING BACK, AS THE SEAT WAS RECLINED TOO FAR FOR ME TO SIT WITH MY BACK AGAINST THE BACK OF THE SEAT. WHEN I WAS TRYING TO BRING THE SEAT BACK FORWARD FROM THE LEANED BACK POSITION, THE HEAD REST CAME DOWN AND SLAMMED INTO MY NECK IT'S AS IF THE MECHANISM THOUGHT THE SEAT WERE GOING TO BE STOWED INTO THE FLOOR. I HAVE BEEN SUFFERING FROM A MASSIVE HEADACHE SINCE THIS HAPPENED. I WILL BE GOING TO MY DOCTOR WHEN I RETURN HOME, TO SEE IF THERE IS ANY SERIOUS INJURY. THERE WAS NOTHING CONCLUSIVE IN THE DIAGNOSIS. THIS NEEDS TO BE ADDRESSED, AS IT COULD CAUSE SEVERE INJURY.