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

Daylight saving time (note: the “‘” is missing at the end of the time change) officially ends at 2 a.m. on Sunday, November 5. At that time, we set our clocks back an hour, allowing more daylight into the morning hours and less into the evening hours.

After the “change,” we’ll stay on standard time until the second Sunday in March, which falls on March 16, 2025, when we return to daylight saving time. The change to standard time occurs on the first Sunday in November each year at 2 a.m.

According to the National Institute of Standards and Technology, daylight saving time was officially adopted in the United States in 1918 as an energy-saving measure to allow more daylight during times when people were outside. It was abolished after World War I and reinstated during World War II. After the war, local authorities were free to determine whether to observe daylight saving time and on which days. The dates for daylight saving time and standard time have been changed several times throughout their history, most recently in 2007, when the Energy Policy Act of 2005 extended the duration of daylight saving time by one month to reduce energy use.

Currently, daylight saving time is in effect for 238 days, or about 65% of the year. Standard time accounts for 127 days, or 35%.

The process of changing the clocks has become increasingly controversial in recent years and there have been efforts – all unsuccessful so far – to abolish the practice.

Not all states observe daylight saving time or daylight saving time. Parts of Arizona that are not part of the Navajo Nation, Hawaii, and the American territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands do not observe daylight saving time.