- At 2 a.m. ET on November 3, Americans will "fall back" by moving their clocks an hour earlier for daylight-saving time.
- While "falling back" means gaining an hour of sleep, it also means the sun will be out for less time during the day.
- The common wisdom about daylight-saving time is that it's about farming, but it's not. The history of daylight-saving time goes back to World War I, when it was thought to save energy.
- Here's the full history of daylight-saving time and why some warmer states don't recognize it.
- Visit Business Insider's homepage for more stories.
On November 3 at 2 a.m. ET, states that recognize daylight-saving time will "fall back" and move their clocks one hour behind to end seven months of daylight-saving time.
People in states that recognize daylight saving time "falling back" gain an hour of sleep, but it also means the sun will be out for fewer hours during the day, making for darker mornings and evenings.
Thinkers including Benjamin Franklin, the New Zealand scientist George Hudson, and the Englishman William Willett advocated for plans that would give them more sunlight in the day going all the way back to the 18th and 19th centuries.
The US and several European countries enacted daylight-saving time during World War I and World War II as an energy-conservation measure and kept it during peacetime.
Today, most of the US, with the exception of Hawaii, Arizona, and many US territories, recognizes daylight-saving time. While many northern states appreciate the extra hour of sun, some states that experience unbearable heat in the summer prefer an hour of night instead.
Here's the full history of daylight-saving time in the US.
SEE ALSO: Daylight Saving Time is literally killing us
The idea for daylight-saving time is attributed to thinkers including Benjamin Franklin, scientist George Hudson, and a British man named William Willett, who published a pamphlet in 1907 titled "The Waste of Daylight," which argued for an extra 80 minutes of sunlight in the summer.
Source: The History Channel
While Britain didn't act on Willett's proposal at the time, Germany implemented daylight-saving time during World War I as a way to conserve electricity by maximizing sunlight.
Source: The History Channel
"They remembered Willett's idea of moving the clock forward and thus having more daylight during working hours," the author and historian David Prerau told National Geographic. "While the British were talking about it year after year, the Germans decided to do it more or less by fiat."
Source: National Geographic
The US also implemented national daylight-saving time during World War I under President Woodrow Wilson in 1918 —but Congress later repealed the measure in 1919.
Source: The History Channel
Multiple studies, however, have since concluded that daylight-saving time has no or negligible benefits when it comes to energy conservation.
Source: History Channel
It's a common misconception that farmers pushed for daylight-saving time in the US to get more time to work outside in the fields.
Source: The History Channel
Because farmers' schedules revolved around sunlight and not the clock, a change in the amount of sunlight threw their entire workday out of whack. Agricultural groups were behind the effort to repeal daylight-saving time in 1919.
Source: The History Channel
After the national repeal of daylight-saving time in 1919, many individual states and cities continued to adjust their clocks twice a year, but at varying days and times, in what Time magazine characterized in 1963 as "a chaos of clocks."
Source: The History Channel
The History Channel reported that at the time, "passengers on a 35-mile bus ride from Steubenville, Ohio, to Moundsville, West Virginia, passed through seven time changes."
Source: The History Channel
In 1966, Congress passed the Uniform Time Act, which set daylight-saving time to begin on the last Sunday in April and to end on the last Sunday in October.
Source: The History Channel
Hawaii, most of Arizona, and a number of US territories do not, however, recognize daylight-saving time — largely because nighttime brings cooler, more bearable temperatures.
Source: National Geographic
"In the summer, everybody loves to have an extra hour of daylight in the evening so they can stay out another hour," Prerau told National Geographic. "In Arizona, it's just the opposite. They don’t want more sunlight, they want less.”
Source: National Geographic
While states can voluntarily opt-out of recognizing daylight saving time, they must pass an act of legislation and obtain approval from the US Congress to make daylight saving time permanent.
Source: NBC Montana
Florida and California, two states, with warm weather throughout the year, have passed or considered bills to observe daylight-saving time year-round — but they would require approval from Congress to actually go into effect.
Source: National Geographic, San Francisco Chronicle
Some studies have linked the decrease in sleep associated with daylight-saving time to negative health effects, such as increases in heart attacks, car accidents, and workplace injuries.
Source: Detroit Free Press, Business Insider
This March, the European Parliament voted to permanently end daylight saving time in the European Union effective in 2021, letting individual countries decide whether to operate on permanent "summer time" or "winter time."
Source: Business Insider
Lawmakers in several states, including Tennesse, Texas, Washington, and Idaho, have introduced legislation this year to end daylight-saving time or make it permanent in their states.
Sources: KING-5 Seattle, Patch, ABC13 Houston, Idaho State Journal, Tennessean
Read more: