Extreme case: Your employer tells you to stay alert in a super-boring job for 8 straight hours or else a person can die or whatever. But that may be an impossibility due to how our brain works.
I'd like to know how many hours was he sitting there and how often did he have to intervene that day /week /month. Uber, maybe, should have had another one checking now and then on drivers. Say one for 10 drivers...