Even a one-hour change in the clock can disrupt the body's circadian rhythms, especially when the clock "springs forward." Charlie Riedel/AP hide caption
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time change
Early mornings may still feel dark and wintry, but the season is about to change. This weekend most of the U.S. will "spring forward" — setting clocks forward one hour — as daylight saving time begins. Maja Hitij/Getty Images hide caption
In this March 5 photo, antique clocks are displayed at the Electric Time Company in Medfield, Mass. Daylight saving time returns Sunday at 2 a.m. local time. Charles Krupa/AP hide caption
The U.S. moved back to Standard Time on Sunday. In this file photo, a man checks clocks at the Electric Time Company factory in Medfield, Mass. Brian Snyder/Reuters /Landov hide caption