I had sleep paralysis as a child, used to believe i was being abducted by aliens. That was terrifying.
While fully conscious though... definitely this one time when i was passing a car (overtaking in british english) and saw another car coming in the opposite direction, and i had to chose between falling back, and waiting or gunning it and making it, i gunned it, and JUST BARELY made it. Definitely had a near death experience.
I'm a much more careful driver now though.