Sleep and Circadian Rhythms

A small study published in Sleep Advances found hypertensive adults who kept a consistent bedtime for two weeks saw modest but meaningful improvements in overnight blood pressure without increasing total sleep time. Participants reduced their night-to-night bedtime variability from about 30 minutes to just a few minutes, which researchers and an outside sleep-medicine expert said likely helped resynchronize circadian rhythms that govern normal blood-pressure dips at night.