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after just a few days, the four- and six-hour group reported that, yes, they were slightly sleepy. But they insisted they had adjusted to their new state. Even 14 days into the study, they said sleepiness was not affecting them. In fact, their performance had tanked. In other words, the sleep-deprived among us are lousy judges of our own sleep needs.
"For most of us, eight hours of sleep is excellent and six hours is no good, but what if we split the difference? http://nyti.ms/ftXHgn
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