Switching over to daylight saving time, and losing one hour of sleep, raised the risk of having a heart attack the following Monday by 25 percent, compared to other Mondays during the year, according to a new U.S. study released on Saturday.
By contrast, heart attack risk fell 21 percent later in the year, on the Tuesday after the clock was returned to standard time, and people got an extra hour’s sleep.
The not-so-subtle impact of moving the clock forward and backward was seen in a comparison of hospital admissions from a database of non-federal Michigan hospitals. It examined admissions before the start of daylight saving time and the Monday immediately after, for four consecutive years.
In general, heart attacks historically occur most often on Monday mornings, maybe due to the stress of starting a new work week and inherent changes in our sleep-wake cycle, said Dr. Amneet Sandhu, a cardiology fellow at the University of Colorado in Denver who led the study.
“With daylight saving time, all of this is compounded by one less hour of sleep,” said Sandhu, who presented his findings at the annual scientific sessions of the American College of Cardiology in Washington.
A link between lack of sleep and heart attacks has been seen in previous studies. But Sandhu said experts still don’t have a clear understanding of why people are so sensitive to sleep-wake cycles.
“Our study suggests that sudden, even small changes in sleep could have detrimental effects,” he said.
Sandhu examined about 42,000 hospital admissions in Michigan, and found that an average of 32 patients had heart attacks on any given Monday. But on the Monday immediately after springing the clock forward, there were an average of eight additional heart attacks, he said.
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