Before going to bed Saturday night, turn your clocks and watches ahead one hour.
The major Canadian exception is most of Saskatchewan, which remains on standard time year-round.
The return to standard time will occur on Nov. 2.
A 1996 study in the New England Journal of Medicine reported an eight per cent increase in the number of motor vehicle accidents on the Monday after the time change.
Sleep experts were quick to blame the rise in accidents on sleepy drivers.