Summary of diurnal cortisol parameters. Shown is (A) wake-up cortisol (time 0), (B) cortisol awakening response (0–30 min), (C) early-decline slope cortisol (30 min to 2 h), (D) late-decline slope cortisol (2 hours to bedtime), (E) bedtime cortisol, (F) total AUC (0 min to bedtime) cortisol, and (G) overall-decline slope cortisol (0 min to bedtime, excluding 30-min cortisol). Reprinted, with permission, from Joseph et al.80