Daylight saving time ends early Sunday, when most Americans turn their clocks back an hour, CBS News and Fox News report. The change comes the night after Halloween, the outlets report.

Hawaii and most of Arizona do not observe daylight saving time, CBS News reports. The country first adopted it in 1918, during World War I, to save fuel, the outlet reports, citing the Congressional Research Service. Phones set to update automatically should change on their own, the outlet reports.

A bill to make daylight saving time permanent, called the Sunshine Protection Act, passed the House in July and is waiting in the Senate, CBS News reports. President Donald Trump supports it and has accused Arkansas Senator Tom Cotton of holding it up, the outlet reports. The bill will die if the Senate does not act before the new Congress takes office in January, CBS News reports.

Doctors say people can ease the change by moving bedtime and meals later in small steps, Fox News reports. California physician John La Puma suggested 15-minute shifts and getting outside later in the day, the outlet reports. "Light is the strongest signal the body clock gets," said Saema Tahir, a New York sleep doctor, Fox News reports.

Tahir warned against using the extra hour for a late night of drinking, Fox News reports. La Puma advised keeping one wake-up time every day, weekends included, the outlet reports.

What we know: Clocks fall back an hour early Sunday in most of the country.
What we don't: Whether the Senate will vote on permanent daylight saving time before January.