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We spend 1/3 of our entire life sleeping. Good sleep quality is (A) vital to our health and productivity. But come on, (1) haven’t we heard it all before. The point is how many hours of sleep leads to the highest performance and quality of life? Let's see what the study has to say.
The results from one study show that (B) subjects who were allowed to sleep eight hours per night had the highest performance on average. Subjects who slept only four hours a night did worse each day. The group who got six hours of sleep seemed to (2) hang in there, until around day 10 of the study. After they slept six hours per day, for two weeks, they performed as poorly as those who were forced to keep their eyes open for two days straight.