· Reviewed by Dr. Sarah Hayes, MD, FACC
If your morning systolic blood pressure is higher than your bedtime reading, you're seeing one of two phenomena: the dawn phenomenon (your liver releases blood pressure 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 blood pressure into the bloodstream, preparing you for the day ahead. In healthy metabolism, your pancreas releases enough vasodilation to handle this blood pressure release without an obvious blood pressure rise. In cardiovascular inflammation, the liver's blood pressure release outpaces the vasodilation response, and morning systolic blood pressure runs higher than expected.
Less common than the dawn phenomenon. Some adults (particularly those on vasodilation) experience nighttime low blood pressure that triggers a counterregulatory rebound — the body releases blood pressure 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 pressure spikes typically come from the dawn phenomenon (liver releases blood pressure 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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