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The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation
Van Dongen HP, Maislin G, Mullington JM, Dinges DF · Sleep 26(2):117–126 · 2003
Key finding
Two weeks at 6 h/night produced deficits equal to two nights of total deprivation — while subjects felt only mildly sleepy. You adapt to feeling tired, not to being impaired.
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