Losing a single hour of sleep when we switching over to daylight saving time raises the risk of heart attack the following Monday by 25% compared to any other Monday during the year, according to a new US study released on Saturday.
Alternatively, heart attack risk fell 21% on the Tuesday after clocks reverted to standard time, when people presumable enjoyed an extra hour of sleep.
Prior studies showed that heart attacks 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.
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.
Researchers cited limitations to the study, noting it was restricted to one state and heart attacks that required artery-opening procedures, such as stents.”
“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.
The overall number of heart attacks for the full week after daylight saving time didn’t change, just the number on that first Monday. The number then dropped off the other days of the week.
People who are already vulnerable to heart disease may be at greater risk right after sudden time changes, said Sandhu, who added that hospital staffing should perhaps be increased on the Monday after clocks are set forward.
“If we can identify days when there may be surges in heart attacks, we can be ready to better care for our patients,” he said.
The clock typically moves ahead in the spring, so that evenings have more daylight and mornings have less, and returns to standard time in the fall. Daylight saving time was widely adopted during World War I to save energy, but some critics have questioned whether it really does so and whether it is still needed.
Researchers cited limitations to the study, noting it was restricted to one state and heart attacks that required artery-opening procedures, such as stents. The study therefore excluded patients who died prior to hospital admission or intervention.
Image of heart from Shutterstock