Dawn Pehnomenon is the term used to describe an elevated morning blood glucose value. It is the body's inherent response driven by circadian rhythm. Circadian rhythm refers to the body's inate and automatic reactions to the daily rotation of day and night. Body functions are in rhythm with the earth's 24 hour cycle. Anticipating the uptick in quick energy requirement needed for waking and first light activity, cortisol is released from the adrenal glands which signals glucagon that triggers the liver to release some of its stored energy (glucose) into the bloodstream. This, elevated blood sugar first thing in the morning.