And I have found that tired employees make huge mistakes on customer critical systems. I have also found that some people are extremely successful working insane hours. They have the capacity to, either it's their personality or they're still young and single. To think that applies to everyone is the issue. Not everyone can work tired and produce good work or do a good job. Would you want someone tired working dangerous machinery just to get something done? We would all be against that.

Yes, it's pretty well established that to move up hours must be put in. The reason this topic comes up time and time again is because no one asks the question why nor do they prove that these hours translate to better work or more productivity. I've seen insane hours in third party consultants. They mess up. A lot.