It's a falsehood that appears intuitively obvious. Working stupid hours destroys not only your productivity and personal life but also your judgment, to the ext

It's a falsehood that appears intuitively obvious. Working stupid hours destroys not only your productivity and personal life but also your judgment, to the extent that you lose the ability to judge your degree of cognitive impairment. It's like coming into work blind drunk: not only are you a liability to yourself and others but you don't realize how much of a liability you are. You may well end up being outcompeted by someone who put in forty hours a week of smart, correctly applied work.