Published: Nov 06, 2010 8:43 PM EDT
Updated: Nov 06, 2010 5:43 PM EDT

WASHINGTON (AP) - Most Americans will get and extra hour of sleep tonight thanks to the annual shift back to standard time.
      
Officially, the change occurs at 2 a.m. tomorrow but most folks will set their clocks back tonight.
      
Remember, it's fall back an hour. Otherwise, you'll be an hour early on Sunday for church, golf or whatever. Residents of Hawaii, most of Arizona and some U.S. territories don't have to change since they did not observe daylight-saving time.
      
Public safety officials say this is also a good time to put a new battery in the smoke alarm, no matter where you live.
      
Daylight saving time returns at 2 a.m. local time the second Sunday in March.