After looking at 20 years of records, Swedish researchers found that the number of heart attacks decreased the Monday after daylight savings time ended, possibly due to the extra hour of sleep most people get. Typically, most heart attacks occur on Mondays due to the increased stress load and activity of the new week. The researchers also noted that the number of heart attacks increased throughout the week after “springing forward” an hour. This may be due to the persistence of sleep disturbance following the reduction of sleep time, which may add to the stress load of the work week.
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