Heart attack rates change with shift of daylight saving time

The risk of heart attacks changes when clocks spring ahead or fall back at the start or end of daylight saving time, according to a study published in the New England Journal of Medicine. Setting the clock ahead in spring for the start of daylight saving time appears to increase the heart attack rates, possibly because of sleep deprivation, said the study based on heart attacks in Sweden. But on the autumn Monday after clocks go back and people can get an extra hour of shuteye, the heart attack risk declines