It negatively affects People's health and sleeping patterns.
Studies also suggest there'll be an increased chance of bleary-eyed workers showing up on Monday morning, due to the shift in sleep schedules. One study found that the shift caused office workers to waste more time on "cyberloafing," while another has linked the onset of daylight saving time to a higher incidence of heart attacks. (And yes, the switch back to standard time appears to reduce heart risk.)
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