Everyone gets an extra hour of slumber because 2 a.m. on Sunday, Nov. 6, marks the end of daylight saving time.
Be sure to turn back your clock an hour as you go to bed Saturday night (or early Sunday morning, if you're out late) so you wake up at the correct time on Sunday.
It also a good time to check your batteries in your clocks, smoke detectors and carbon monoxide detectors.
Daylight saving time has been used in some fashion since 1916 and was started to help conserve fuel needed to produce electric power, according to WebExhibits.org. Its use changed several times over the next several decades.
We spring ahead on March 11 and fall back Nov. 4 in 2012. In 2013, clocks go ahead on March 10 and are set back an hour on Nov. 3.
Each year, clocks are moved ahead an hour on the second Sunday in March and reverts to standard time on the first Sunday in November.
Not everywhere in the world—or United States and its territories—recognize daylight saving time.
According to WebExhibits.org, Hawaii, the American Samoa, Guam, Puerto Rico, the Virgin Islands, the Commonwealth of Northern Mariana Islands and Arizona do not observe daylight saving time.