Stress in modern flying
I go back far enough to remember Constellation, DC7 and Britannia pilots almost staggering out of the aircraft, after being up to eighteen hours on duty, required to be ready again after twelve hours, to resume. They would have been very busy, in cramped cockpits, with cigarteete smoke being the norm in the cockpit, or cigar smoke, if they were Americans. I think they did not have the same stress factor, as there was a certain amount of activity in the cockpit, at all times duting the flights, so they were not bored and definetly not liable to fall asleep. They were not limited to JAR regulatory hours and, although reasonably well paid, were not rich. The old duty-free was often the nightcap, before collapsing into deep sleep. Boredom causes stress and the less the requirement for use of grey matter and old-fashioned manual flying skill, due to the advent of computerised flying, causes even more stress.