It's time. Get ready to change your clocks back an hour this weekend because daylight saving time is ending for the year.

On Sunday, Nov. 2, at 2 a.m., clocks will "fall back" to standard time , where they will remain until next spring. Since we gain an hour , you can enjoy an extra hour of sleep that morning, as time shifts from 1:59 a.m. back to 1 a.m.

You will, however, begin to see the sun set around 4:30 p.m. starting next week.

But, while most Americans adjust their clocks back by one hour on Nov. 2, residents of Hawaii, Arizona, and some U.S. territories do not. Here's what to know.

Why does daylight saving time exist?

Daylight saving time was first introduced in the U.S. in 1918 under the Standard Time Act as a measure to save on fuel costs during World War I by adding

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