Americans will set their clocks back Sunday morning as daylight saving time ends, even as a national debate rages over whether the tradition of changing between daylight saving and standard time should be abolished.

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Lawmakers are debating whether Daylight Saving Time should be abolished or made permanent.

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At 2 a.m., the sun goes down. Daylight saving time in the U.S. will return to standard time on Sunday, but sunrise and sunset will be an hour earlier and the nights will get darker.

The Senate passed a bill in March that would make daylight saving time permanent, but the bill has not been passed by the House.

The bill would apply to every state except Hawaii and Arizona, which observe year-round standard time.

The process of changing the clock twice a year has been linked to increases in traffic accidents, robberies, workplace injuries and heart attacks.

There are bills in Arkansas, Arizona, California, Colorado, Delaware, Florida, Illinois, Louisiana, Maine, New Jersey, Oregon, South Carolina, Tennessee, Utah and Washington to make daylight saving time permanent.

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Scientists studying sleep warn a transition to permanent daylight saving time could affect Americans. According to a study in the Journal of Health Economics, the result is that people's social and biological time drift apart, creating a phenomenon known as "social jet lag." According to the University of Massachusetts Chan Medical School-Baystate professor, that could increase the risk of health problems.

Big Number

More than sixty percent. A survey done by the American Academy of Sleep Medicine in July of last year found that 42% of US adults want to eliminate seasonal time changes.

Key Background

The debate over daylight saving time is almost as old as the practice itself, as lawmakers attempt to do away with standard time altogether. The semi-annual changing of the clocks began in 1918 as an initiative to save fuel, give shoppers extra time after work, but federal officials left it up to state and local lawmakers to decide when they should reset their clocks. After three years of planning, the Uniform Time Act was approved by Congress in 1966. Daylight saving time was extended from the first Sunday in April to the second Sunday in March and from the last Sunday in October to the first Sunday in November. A bipartisan group of lawmakers are attempting to change America's time. The senator from Massachusetts said in a statement last year that permanent daylight saving time is positive for consumer spending and energy consumption.

A study found that Daylight Saving Time would save lives by cutting deer accidents.

Daylight Saving Time is here, and it could be the last time weSpring forward.

Daylight saving time is not settled despite the fact that the clock turns back this weekend.

There is a brief history of daylight saving time.