http://dealbook.nytimes.com/2014/06/27/ ... advantage/
Too many of us continue to live by the durable myth that one less hour of sleep gives us one more hour of productivity. In reality, each hour less of sleep not only leaves us feeling more fatigued, but also takes a pernicious toll on our cognitive capacity. The more consecutive hours we are awake and the fewer we sleep at night, the less alert, focused and efficient we become, and the lower the quality of our work.
The research is overwhelming that the vast majority of us require seven to eight hours of sleep to feel fully rested, and only a small percentage require less than seven.
