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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 4.

Figure 4

Simulation of 24 h of spontaneous sleep/wake, generated using the homeostatic mechanism. (A) Arousal state (thick line), and the circadian drive (thin line) as functions of time. (B) Homeostatic drive (H) 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.