Daylight saving time begins on Sunday, March 8 when clocks move ahead one hour at 2 a.m.

It's an annual time change that moves one hour ahead to add more daylight to the evening during the warmer months in the United States. You'll lose one hour of sleep, but you'll gain more daylight, with later sunsets and earlier sunrises. 

The practice started with the Standard Time Act in 1918, according to the Library of Congress.