Main Question or Discussion Point
After almost falling asleep while driving the other day, I got to thinking about CO2. I started to wonder if due to normal respiration of the driver and or occupants, CO2 levels in a car can rise to levels that can inhibit responses or even lead to unintended sleep, and make driving unsafe. I was struck by how quickly I regained composure as soon as I opened the window for fresh air. Maybe cars are too air tight for our own good?