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Daylight Saving Time 2013 begins this Sunday March 10 at 2 a.m. Don’t forget to put your clocks forward one hour.

Daylight Saving Time traditionally begins on the second Sunday of March and ends on the first Sunday of November.

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The change in the clocks means one less hour of sleep Saturday night and has traditionally resulted in many people showing up to work or an appointment an hour late.

Fire safety officials also like to point out that this is a good time to switch the batteries on your smoke detectors.

According to the Government of Canada’s official time zones information page, Daylight Saving Time usually has been regulated by provincial and territorial governments.

Here are four things you may not know about daylight saving time.

It messes up your sleep patterns so badly it could kill you:

A 2012 study indicated that heart-attacks spike in the weeks right after Daylight Saving kicks in. The study showed that the number of heart attacks jumped almost 55% in the weeks just following the switch to Daylight Time.