'"The physiological effects of tiredness are well-known. You can turn a smart person into an idiot just by overworking him," notes Peter Capelli, a professor of

'"The physiological effects of tiredness are well-known. You can turn a smart person into an idiot just by overworking him," notes Peter Capelli, a professor of management at Wharton.' I've definitely felt this. I tried to explain it to my boos once. 'My brain feels dead, sir. I can't code any more. I need a break'. That wasn't received so well, but I got out of there.