Turn back time: Daylight saving ends

It's the best weekend of the year: You get an extra hour of sleep.

Thank the end of daylight saving time. At 2 a.m. Sunday, U.S. clocks will move back one hour.

In the United States, daylight time runs from 2 a.m. on the second Sunday of March until 2 a.m. on the first Sunday of November in areas that don't exempt themselves.

Most of the United States observes the time change, but not every place makes the switch. The exceptions are Hawaii, most of Arizona, Puerto Rico, the Virgin Islands, American Samoa, Guam and the Northern Marianas.

P.S. Now is a good time to change the batteries on your smoke detectors, too.