Irregular sleep, such as sleeping for an inconsistent number of hours each night or falling asleep at different times, may increase the risk of developing atherosclerosis, or the hardening of the arteries, among adults over age 45, a new study suggests.
Atherosclerosis is the buildup of fatty deposits, known as plaque, on artery walls. This can lead to narrowed arteries and reduced blood flow and oxygen in the body. The plaque can also burst and create a blood clot that blocks the artery, which can lead to a heart attack or stroke.
Between 2010 to 2013, the people in the study wore a wrist device that detected when they were awake and asleep for 7 days in a row, and they completed a 7-day sleep diary. They also completed a one-night sleep study to measure sleep disorders that involve breathing, sleep stages, and heart rate. Across the 7-day period, about 38% of participants had a sleep duration change of more than 90 minutes, and 18% had a sleep duration change of more than 120 minutes. Those who had irregular sleep were more likely to be non-white, current smokers, have lower average annual incomes, work shift schedules or not work, and have a higher average body mass index.
“The biggest surprise to me was that 30% of the participants in the study had total sleep times that varied by more than 90 minutes over the course of the week,” Full says. “This is consistent with prior studies that suggest that a large proportion of the general public have irregular sleep patterns, not just shift workers.”
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