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.