The dawn phenomenon, sometimes called the dawn effect, is an early-morning (usually between 2 a.m. and 8 a.m.) increase in blood sugar (glucose) which occurs to some extent in all humans, more relevant to people with diabetes. It is thought to occur due to temporal elevation in serum cortisol, epinephrine and norepinephrine associated with transition from sleeping to wakefulness.
Basically, it is a natural 'breakfast'.
Lowering the dawn effect is possible by eating a last meal low in carbohydrates.
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