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Trump's plan to end daylight savings: Will 4:30 a.m. be the new American daybreak?

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President-elect Donald Trump has vowed to end daylight savings time.

If carried through, it would dramatically alter U.S. life in spring and summer months when Americans revel in sunshine well into nighttime hours .

Opponents of daylight savings say it can pose a risk of mood disorders, adverse cardiovascular events and car crashes.

Some business interests have also advocated for daylight savings time, believing it could lead to more afterwork commerce if it's not too dark.

The U.S. briefly adopted year-round daylight in 1974-75 , in hopes of pushing more daylight into later hours and cutting energy use during the OPEC oil embargo.