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Mean reaction times (RT) on the Psychomotor Vigilance Task (PVT) are plotted as a function of Circadian Phase (zero degrees is the fit melatonin maximum) and Wake Duration (hours elapsed in scheduled wake episode). The top panel contains data from the Chronic Sleep Restriction (CSR) condition. The bottom panel contains data from the Control condition. Each column shows one week (four 42.85-h “days”) of data.
