The inability to stay awake and alert when in a car, or any other thing that moves, such as trains, planes, and busses.
The act of passing out while in a car regardless of passenger or driver status.
Victims of Carcolepsy typically show symptoms such as falling asleep as soon as a car begins to move, waking up hungry and complaining of a sore neck for hours.
Mom: "Oh, yeah. He's got that Carcolepsy.
I tend to be Carcoleptic, so I bring a pillow with me on road trips.