Daylight saving time ends Sunday. Here's what to know

"It's that time of year again: Many Americans will have to reset their clocks and circadian rhythms when daylight saving time ends on Sunday. That means, in most states, lighter mornings and darker evenings. At 2:00 a.m. on Sunday, the time for millions across the country will jump back one hour an adjustment that has been both welcomed by those seeking extra sleep time or criticized by those who see it as an inconvenience. Here is what you should know."

"How many states observe daylight saving time? Every U.S. state observes daylight saving time except for Hawaii and Arizona, according to the National Conference of State Legislatures (NCSL). The portion of the Navajo Nation that's in Arizona, however, does observe daylight saving. U.S. territories Guam, Puerto Rico, American Samoa, the Virgin Islands and the Northern Mariana Islands also don't change their clocks. Many more want to. Nineteen states have enacted legislation that would create daylight saving time for its residents year-round, the NCSL said."

Daylight saving time ends at 2:00 a.m. on Sunday, when clocks roll back one hour, producing lighter mornings and darker evenings in most states. Every U.S. state observes daylight saving time except Hawaii and Arizona, while U.S. territories Guam, Puerto Rico, American Samoa, the Virgin Islands, and the Northern Mariana Islands do not change clocks. Nineteen states have passed measures to adopt year-round daylight saving time, but federal law must change before states can make DST permanent. Polling shows 56% prefer permanent DST, 42% prefer permanent standard time, and only 12% support the current twice-yearly system. Legislative attempts to make DST permanent have repeatedly failed.

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