It's as controversial as its supporters say it's necessary - but like clockwork, daylight savings leaves hundreds of millions of Americans waking up groggy one Sunday in March.While some enjoy clawing back more daylight later on in the day - others resent losing an hour of sleep.Indeed, while the US has practiced daylight savings more or less consistently since 1918, fewer than 40 percent of the countries of the world still do so.
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