LOS ANGELES (CBSLA.com) — Sunday marks an end to daylight saving time and may mean an extra hour of sleep for some.

California and 47 other states will “fall back” one hour at 2 a.m. as the state reverts to Pacific Standard Time.

Fire officials urged residents to use the clock changing exercise to replace batteries in smoke and carbon monoxide detectors as well as flashlights.

The National Fire Protection Association estimates that nearly 3,000 people die each year in the U.S. in house fires and smoke alarms cut that risk in half.

Hawaii and most of Arizona do not observe daylight saving time, which returns in March.

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