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To evaluate how sleep time and quality relate to blood pressure, investigators for the CARDIA cohort study conducted an ancillary study beginning at the 15-year examination in 2000–2001. Of 578 participants (mean age, 40), 41% were black and 56% were women. During the following 5 years, sleep duration and maintenance (an indicator of sleep quality) were measured twice (with about 1 year between measurements) by wrist activity monitors worn for 3 consecutive days. Mean sleep duration was 6 hours per night; 43% of participants slept <6 hours per night. On average, participants were awake approximately 11% of the time between falling asleep and final awakening.
Overall, mean systolic blood pressure increased and mean diastolic blood pressure de…