Get ready to enjoy an extra hour of sleep – at least for one day.

Daylight saving time ( note – no ‘s at the end of saving) officially ends at 2 a.m. Sunday, Nov. 5. At that time, we move our clocks back an hour, pushing more daylight in the morning hours and away from evening.

After we “fall back” we will remain on standard time until the second Sunday in March, which falls on March 16, 2025, when we return to DST. The changeover to standard time occurs each year on the first Sunday in November at 2 a.m.

According to the National Institute of Standards and Technology, DST was formally introduced in the U.S. in 1918 as an energy-saving measure designed to put more daylight into times when people were outside. It ended after World War I only to be brought back during World War II. After the war, local jurisdictions were free to determine whether they observed DST and the dates they used. The dates for DST and standard time have changed multiple times throughout its history, including most recently in 2007 when the Energy Policy Act of 2005 extended the length of DST by one month in the interest of reducing energy consumption.

DST is now in effect for 238 days, roughly 65% of the year – with standard time accounting for 127 days or 35%.

The time change process has grown increasingly controversial in recent years and there have been efforts – so far all unsuccessful – to do away with the practice.

Not all states observe DST or changing the clocks. Parts of Arizona not included in the Navajo nation, Hawaii and American territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico and the U.S. Virgin Islands do not observe the time change.