Clocks hang on a wall in Hands of Time, a clock store and repair shop in Savage, Md., Friday, March 8, 2013. It’s the weekend to spring ahead for daylight saving time. Officially, the change starts Sunday at 2 a.m., and most Americans will get an hour less sleep but will gain an hour more of evening sunlight in the coming months. 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. (AP Photo/Patrick Semansky)

Clocks hang on a wall in Hands of Time, a clock store and repair shop in Savage, Md., Friday, March 8, 2013. It’s the weekend to spring ahead for daylight saving time. Officially, the change starts Sunday at 2 a.m., and most Americans will get an hour less sleep but will gain an hour more of evening sunlight in the coming months. 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. (AP Photo/Patrick Semansky)

FILE – In this March 7, 2013, file photo the sun breaks through clouds over the U.S. Capitol in Washington. Daylight-saving time begins at 2 a.m. Sunday, March 10, 2013, when clocks officially move ahead an hour. (AP Photo/J. Scott Applewhite, File)