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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: Sleep Med Rev. 2013 Feb 16;17(4):241–254. doi: 10.1016/j.smrv.2012.09.005

Figure 1. The 24-hour plasma ACTH (top) and cortisol (bottom) concentrations in insomnia patients (■) and controls (○).

Figure 1

The thick black line on the abscissa indicates the sleep recording period. Error bar indicates standard error (SE). *P < .01. Based on findings by Vgontzas et al17