When Canadians "spring forward" this week we may end up losing more than just a few hours of sleep that can have deadly effects, scientists say.

Swedish researchers found there were more heart attacks in the week after springing forward -- especially during the first three days of the week.

Daylight time was first enacted in Germany in 1915, and then quickly adopted by Britain and much of Europe and Canada.

Because the sun shone for a time while most people were asleep, it was reasoned that light could be better used during the day. The solution was to push the clocks ahead one hour in springtime, forcing people to wake an hour earlier. They would therefore expend less energy trying to light their homes, for instance, if time were adjusted to suit their daily patterns.

Daylight time for 2010 begins at 2 a.m. on Sunday, March 14. Be sure to set your clocks ahead one hour.

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