Share----WASHINGTON (AP) -- Get ready for more outdoor fun.

For most Americans, daylight saving time has returned, shifting an hour of light to the evenings. But there is a downside. Assuming you're not working the overnight shift, you'll lose an hour of sleep.

The official change occurred at 2 a.m. Sunday, local time. If you didn't set your clocks ahead an hour before going to bed, now is as good a time as any.

The shift also serves as a reminder to install new batteries in warning devices such as smoke detectors and hazard warning radios.

Some parts of the country don't observe daylight time, including Arizona, Hawaii and several U.S. territories.

The government expanded daylight saving time in 2007 in an effort to save energy. It begins on the second Sunday in March and continues until the first Sunday in November. So for the first time, the "spring ahead" part of the old saying will actually be happening when it's still winter.

From:http://www.boston.com/news/nation/washington/articles/2009/03/08/did_you_remember_to_set_the_clock_ahead_an_hour/