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August 20, 2019

The Monday after daylight savings brings a 24% uptick in heart attack patients

March 11, 2019
Howie Brown adjusts the time on a clock back one hour for the end of day light savings time at Brown’s Old Time Clock Shop November 2, 2007 in Plantation, Florida. (Joe Raedle / Getty Images)

Now that you’ve set your clock ahead an hour, it’s time to check your ticker.

Hospitals see a 24% increase in heart attack patients the Monday following daylight savings time, according to a study published in the British Medical Journal study. By Tuesday, reports of heart problems drop back to near their normal rates. That study also shows a 24% decrease in heart attack claims when clocks are set back an hour in the fall.


“That’s how fragile and susceptible your body is to even just one hour of lost sleep,” Matthew Walker, author of “How We Sleep” told Business Insider. Their report finds that “springing ahead” causes people in time zones that abide by the rule to lose 40 minutes of sleep. Those who work the night shift will also lose an hour of work, which could reduce pay.

The only states in the U.S. that don’t adjust for the time change are Hawaii and Arizona. Indiana became the 48th state to recognize Daylight Saving Time in 2006, 12 of its 92 counties are on Central Standard Time while the other 80 are an hour ahead on Eastern Standard Time.

The research, which relies on a limited sample size between 2010 and 2013, was conducted by two researchers from the University of Michigan and a third from the University of Colorado.

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