Circadian System Disruptions in Sleep Apnea Increase the Risk of Nighttime Cardiac Events

Dec 15th 2025 10:31pm EST

STORY AT-A-GLANCE New research shows that people with untreated sleep apnea experience a sharp nighttime drop in blood vessel function driven by the circadian system, increasing vulnerability to heart attacks and other cardiac events In a tightly controlled sleep-lab study, participants’ arteries showed their worst ability to dilate around 3:00 a.m., revealing an 82% decline […]

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