The practice of falling back in the U.S. started in 1918 during World War I as a way to conserve fuel. By moving the clocks ahead an hour, backers believed the country could divert a bit of coal-fired electricity to the military instead of using it for an hour of home power. It was reenacted in World War II.

(NEXSTAR) — If you’re reading this outside of two specific states, the digital clocks in your home have likely fallen back an hour (though maybe you didn’t even notice). Daylight saving time officially came to an end at 2 a.m., kickstarting our multimonth observance of standard time.

Here’s your reminder that daylight saving time ended at 2 a.m. Sunday, so clocks should be set back one hour. Digital devices typically adjust automatically, but manual clocks will need to be reset. It also means that, in most states, people will have lighter mornings and darker evenings.