I pulled out of my parking lot at work, blinked, and suddenly found myself half way home with no memory of how I got there. I was so freaked out I pulled over to check my car for damage (there wasn't any). My route home involved a highway and several stop signs and lights at very busy junctions, goodness knows if I stopped for any of them. Drove very carefully the rest of the way home and swore never to drive tired again. I'd just pulled a 14 hour shift, and had a newborn at home so wasn't getting much sleep to begin with.