To return to the topic at hand, as long as the technology and laws do not permit it, I would say that a driver with closed eyes would be a dangerous situation. Maybe one could pull up ahead of the car (to reduce the risk of collision), and then honk to alert the driver to the danger they pose to themselves and others? And then, if there is no reaction, make the call?
Some have suggested that if you see this situation you could use your car to guide the autopilot to a stop, since the TACC would slow it down as it followed you.
I've also noticed with slow/stop and go traffic, AP will often lose the lane markings (blue or grey) and rely on the car in front. If the lead car changes lanes slowly enough (so AP doesn't pick up speed to see the lines) the Tesla will follow the lead car into the next lane. Mine almost did a few times in heavy traffic.
This maybe a useful way to guide the Tesla AP to the side of the road.