People across most of North America may be a little groggy Sunday morning after losing an hour of sleep as daylight time takes effect.

As usual, Saskatchewan won't be springing ahead.

The times change means one hour of time in dreamland will disappear, unless you go to bed earlier.
(Canadian Press)

Daylight time begins at 2 a.m. local time on the second Sunday in March and ends at 2 a.m. on the first Sunday in November. In Newfoundland and Labrador, the time will change at one minute after midnight.

Before 2007, clocks in most of North America were reset one hour later on the first Sunday in April and turned back one hour the last Sunday in October.

But Canadians adopted the U.S. schedule introduced last year to save energy, assuming the change would encourage people to leave indoor lights off for longer periods.

Most of Saskatchewan has not observed daylight time since 1966 and stays on Central Standard Time all year round. Some border towns follow the time schemes of their neighbours in Manitoba or Alberta.

Elsewhere in Canada, areas of Quebec east of 63 degrees west longitude do not change to daylight time and remain on Atlantic Standard Time year round. Pockets of Ontario and British Columbia do not use daylight time.

Sleep experts say many will feel a little sleep deprived and require two or three days to adjust to the time change, especially if they already have a sleep deficit.

Fire departments recommend that people use the twice-yearly changes to their clocks to put new batteries in their smoke detectors.