Cortisol Awakening Response

**Definition:** A physiological response to awakening. It is a discreet and distinct component of the CORTISOL circadian cycle, with characteristics unrelated to cortisol secretion throughout the rest of the day (Wilhelm et al., 2007; Fries et al., 2009).

**Tree numbers:** - G07.192

**Synonyms:** - Cortisol Awakening Response (CAR)