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February 15, 2018 6:08 AM EST The European Parliament called for an investigation into daylight saving time on health grounds on Feb. 8, following other legislatures scrutinizing the
practice of changing clocks every year. Here’s more. THE EUROPEAN CASE Critics of moving clocks an hour forward every summer say it disrupts human biorhythms. Supporters say the practice has
benefits, like preventing traffic accidents, and a 2014 study found that the overwhelming majority of E.U. member states were happy with it. THE AMERICAN CASE In the U.S., states that wish
to end daylight saving time must petition Congress, as Arizona did in 1968. But some states want DST to last all year; California and Florida are either considering or pushing bills that
would move the clocks an hour forward permanently. THE RUSSIAN CASE Russia switched to permanent winter time in 2014 after a failed experiment to put clocks on year-round summer time in
2011. The policy apparently caused health issues in northern Russia, where mornings would remain darker for longer during the winter months.