Cortisol awakening response
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The cortisol awakening response (CAR) is an increase of about 50% in cortisol levels occurring 20–30 minutes after awakening in the morning in some people. This rise is superimposed upon the late-night rise in cortisol which occurs before awakening. It is thought to be linked to the hippocampus' preparation of the hypothalamic-pituitary-adrenal axis (HPA) to face anticipated stress.
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