Time to fall back.

Most Canadians and Americans will be able to get an extra hour of sleep this weekend thanks to the annual shift back to standard time.

The change officially occurs at 2 a.m. Sunday, but most people will set their clocks back before heading to bed Saturday night.

Residents of most of Saskatchewan, Hawaii, most of Arizona and some U.S. territories don’t have to change since they do not observe daylight saving time.

There are exceptions: Pickle Lake, New Osnaburgh and Atikokan in northwestern Ontario don’t change their clocks all year. The same is true for pockets of British Columbia, Quebec and Nunavut.

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 started on March 10 and returns at 2 a.m. local time March 9.

The U.K. and many other European countries changed their clocks last weekend