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Health impacts of daylight saving time (DST) are much larger, according to scientists

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The origins of daylight saving time lie in Europe , where it was first introduced in Germany in 1916 .

DST was increased from its original six month stretch over May through October first forward to the first Sunday in April in 1987 .

At present, not everywhere in the U.S. follows DST with exceptions including the states of Arizona and Hawaii and the territories of American Samoa , Guam , the Northern Mariana Islands , Puerto Rico and the Virgin Islands .

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