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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 6.

Figure 6

Simulation of 24 h of spontaneous sleep/wake, generated using the circadian mechanism. (A) Arousal state (thick line) as a function of time, shown with the circadian drive, C/2 (thin solid line), which varies with arousal state, and the sinusoidal component, C − Z (thin dashed line). The latter is not divided by 2 so that they can be seen on the same axes. (B) Homeostatic drive as a function of time. (C) Path of the system in phase space (thick line), with arrows indicating the direction of motion. Thin gray lines indicate the demarcations between arousal states, as per Figure 1.