Daylight saving time begins on Sunday, March 9, meaning most Americans will lose an hour of sleep as we "spring forward."

After a long winter of short days, it’s finally time to spring forward. Clocks across the U.S. will jump from 1:59 a.m. to 3 a.m. Sunday. Here’s what you need to know about daylight saving time and why we change the clocks twice a year in the U.