Most of the United States will "spring forward" on Sunday, March 10.

Here's what to know about Daylight Saving Time.

POLL: Should Daylight Saving Time be year-round?

Benjamin Franklin invented Daylight Saving Time.

The main purpose was to make better use of daylight hours, adding more light in the evenings. The argument was that early-morning sun wasn't "used," so people like Franklin and London builder William Willett thought the sunlight would be better used in the evenings.

It's Daylight Saving Time, not Daylight SavingS Time.

No S. You've probably been saying it wrong your whole life. 

The clocks change at 2 a.m. to minimize disruption to your day.

The choice to make Daylight Saving Time begin at 2 a.m. was originally because most people were at home and few businesses are affected.

It's actually not observed in every state.

Hawaii and Arizona, as well as several U.S. territories, don't observe Daylight Saving Time. So, if you hate having to switch your clocks twice a year, you know where to move.

It's controversial.

Adjusting to a new sleep schedule can be difficult for everyone, but especially people with sleep disorders, who have taken issue with the twice-a-year time change. Parents also argue Daylight Saving Time can be dangerous for their schoolchildren, since there is less light in the mornings when students are walking to school or waiting for school buses.