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. Author manuscript; available in PMC: 2020 Nov 5.
Published in final edited form as: Sleep Med Clin. 2009 Jun 9;4(2):111–125. doi: 10.1016/j.jsmc.2009.02.001

Fig 1.

Fig 1.

Circadian and homeostatic regulation of sleep and wakefulness in humans. Panel A: Increase of homeostatic sleep pressure during wakefulness and its dissipation during sleep as reflected in EEG SWA during daytime naps and nocturnal sleep 25. Circadian variation in wake/sleep propensity as reflected in the latency to sleep onset (Panel B) after 18h:40 min of wakefulness and wakefulness (Panel C) in sleep opportunities, measured during forced desynchrony of the sleep-wake cycle and endogenous circadian rhythms of melatonin (Panel D) and core body temperature (Panel E) 30