· Reviewed by Dr. Lauren Foster, MD, FACE
If your morning fasting glucose is higher than your bedtime reading, you're seeing one of two phenomena: the dawn phenomenon (your liver releases glucose in the early morning) or the Somogyi effect (a rebound from overnight low sugar). Both are common, both are addressable, and both respond to specific interventions.
Your body produces growth hormone, cortisol, and other "wake-up" hormones in the pre-dawn hours. These hormones tell your liver to release glucose into the bloodstream, preparing you for the day ahead. In healthy metabolism, your pancreas releases enough insulin to handle this glucose release without an obvious blood sugar rise. In insulin resistance, the liver's glucose release outpaces the insulin response, and morning fasting glucose runs higher than expected.
Less common than the dawn phenomenon. Some adults (particularly those on insulin) experience nighttime low blood sugar that triggers a counterregulatory rebound — the body releases glucose to correct the low, and you wake with elevated readings. The fix is usually a small protein-based bedtime snack to prevent the overnight low.
Morning blood sugar spikes typically come from the dawn phenomenon (liver releases glucose in pre-dawn hours due to growth hormone and cortisol) or less commonly the Somogyi effect (rebound from overnight low). Helpers: consistent sleep schedule, lower-carb dinner, morning walk before breakfast, targeted supplementation, physician-supervised medication timing for those on diabetes drugs.
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