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. Author manuscript; available in PMC: 2022 Dec 11.
Published in final edited form as: Am J Physiol Regul Integr Comp Physiol. 2008 Apr 16;294(6):R1980–R1987. doi: 10.1152/ajpregu.00925.2007

Fig. 4.

Fig. 4.

Normed relative transition frequencies between W, R, and S every 90 min from the first appearance of stage I sleep for healthy controls (black) and patients with CFS (gray). *P < 0.05 and **P < 0.01 from healthy controls.