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Physiology of sleep and dreaming - page 20 / 26

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Overall sleep deprivation

Under total, voluntary sleep deprivation, sleepiness is cyclical

Greatest sleepiness from 3-6 a.m.

Waking sleepiness is countered by activity

Sleepiness increases only up to four days

Active, complex tasks are not impaired

Easy, boring tasks are impaired

Microsleep emerges

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