WASHINGTON (AP) -- Most Americans will get a chance at an extra hour of sleep this weekend, as the clocks fall back to standard time.
It's the last time this will happen in October.
Thanks to a law passed last year, daylight-saving time will start earlier and end later beginning in 2007. It will last from the second Sunday in March to the first Sunday in November.
The clock change switches an hour of daylight from evening to morning, meaning drivers will need to be extra careful on Halloween night to be sure of avoiding excited little trick-or-treaters.
The official change occurs at 2 a.m. Sunday, though most folks will make the change before going to bed Saturday night.
Some states and territories don't observe daylight-saving time and won't have to worry about changing their clocks. Those are Arizona, Hawaii, Puerto Rico, the Virgin Islands, American Samoa, Guam and the Northern Marianas.
Daylight-saving time returns next March 11.
So don't forget, Spring ahead, Fall behind.
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Clocks fall back, but daylight-saving time getting longer 
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