Daily Mail, UK - People who go to bed at inconsistent times and sleep less than eight hours a night may be twice as likely to suffer major heart problems, according to a new study.
Researchers at the University of Oulu in Finland followed 3,231 adults for ten years to study how sleep patterns affect heart health.
Participants wore wearable devices that recorded when they went to bed, woke up, and the midpoint of sleep, which is the halfway point between falling asleep and waking.
To identify who had irregular sleep schedules, the researchers measured how much these times varied each day over seven consecutive days.
During the ten-year follow-up, 128 participants - about four per cent - experienced major heart events, including heart attack, stroke, unstable angina, hospitalisation for heart failure, and even death from cardiovascular disease.
People with highly variable bedtimes or sleep midpoints were at significantly higher risk - but only if they slept less than the median of seven hours and 56 minutes per night.
Those who slept longer than this did not show the same increased risk.
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