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(NEW YORK) — It’s that time of year again when you’re not sure which way you’re supposed to turn the clock.

Unfortunately, Saturday night into Sunday morning is the time when daylight saving begins and the clock moves forward, so you lose an hour of sleep.

If you live in parts of Arizona or Hawaii, however, you don’t observe daylight saving time. So why do parts of the U.S. do it while others don’t?

It’s important to understand why the practice was implemented in the first place.

According to Michael Downing, Tufts University lecturer and author of Spring Forward: The Annual Madness of Daylight Saving Time, before daylight saving “we were sleeping through those early morning sunrise times in the summer and that was considererd a waste of tremendous natural resource.”

We do it mostly to save energy, and to have an extra hour of sunlight in the evening when we would be more productive during the warm weather.

In Arizona, people believe the practice is unneccessary because of the hot climate. Activities in the state are easier to do in the evening, when it’s darker and cooler. And in Hawaii, American Samoa, Guam, Puerto Rico, and the Virgin Islands, there is no daylight saving time because their locations are close to the equator and warm climates provide little change in sunlight throughout the year.

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