Research Article

A Preliminary Evaluation of the Physiological Mechanisms of Action for Sleep Restriction Therapy

Figure 3

Evening and morning cortisol levels compared to their respective average for participants 1, 2, and 3. 0 as z-score means participant’s average of cortisol levels. A negative z-score means a cortisol level lower than participant’s average while a positive z-score means a cortisol level higher than participant’s average of cortisol levels.
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