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. Author manuscript; available in PMC: 2014 Feb 21.
Published in final edited form as: J Theor Biol. 2012 Dec 5;319:10.1016/j.jtbi.2012.11.029. doi: 10.1016/j.jtbi.2012.11.029

Figure 2.

Figure 2

Ultradian oscillations of NREM sleep and REM sleep at a fixed circadian phase during 8 h of enforced Sleep (x = 0) using the homeostatic mechanism. The y-axis shows arousal state, W = Wake, R = REM sleep, N = NREM sleep. Simulations are at (A) the circadian wakefulness maximum, C = 1, and (B) the circadian wakefulness minimum, C = 0. Plotted are arousal state (thick solid line) and homeostatic drive (dashed line).