LifeDev

“Software development is rarely a sprint, it’s a marathon. It’s multiple marathons, actually. So trying to extract 110% performance from today when it means having only 70% performance available tomorrow is a bad deal. You end up with just 77% of your available peak. What a bad trade.

This is why I’ve always tried to get about 8 1/2 hours of sleep. That seems to be the best way for me to get access to peak mental performance. You might well require less (or more), but to think you can do with 6 hours or less is probably an illusion. Worse, it’s an illusion you’ll have a hard time bursting. Sleep-deprived people often vastly underestimate the impact on their abilities, studies have shown.”

Sleep deprivation is not a badge of honor - (37signals)