Kerry Kennedy may have had a seizure while she was driving on Friday morning, sources tell the New York Post on Sunday. Kennedy, who is the daughter of Robert F. Kennedy and the ex-wife of New York Gov. Andrew Cuomo, was driving down a busy New York highway when she sideswiped a tractor-trailer. Though the 52-year-old was able to steer her car to an exit ramp and off the road, she has no recollection of the incident. Police found her slumped over in her car, unaware of what had happened. A breathalyzer test showed she didn't have any alcohol in her system, and blood and urine tests came back negative for drugs—although some sources have suggested she was on the sleeping drug Ambien at the time of the accident.