I honestly think you could view this pretty much as you would someone sleep-walking. He may have been functioning on a lower level, completely unaware consciously of what he was doing.
When I had my tonsils out as a kid, I was causing all sorts of trouble for the staff in the recovery room, as if I was awake. I seemed quite lucid. I remembered none of it afterwards.
Hitting the primary car again, is a pretty good indicator this guy was not operating on all cylinders. When they found him after the next impact, he was unconscious.
I’m sure this will be investigated, and I think the guy will have to answer for his medical condition and if he was taking enough precautions to make sure this type of thing didn’t happen.
It would be interesting to see how this plays out. I think he’s going to pay for it in a number of ways.
Sleepwalking and seizures are completely different phenomena. With sleepwalking, you are unconscious but your lower brain functions can still perform basic tasks, and even complex tasks that you do habitually, such as going to the bathroom, going up/down stairs, even preparing and eating food, or having a simple conversation.
With a seizure, it is like an electrical storm happening in your brain’s neural pathways. There is no portion of the brain that is not affected, so there is no possibility of continuing on with any kind of voluntary, non-random behavior.