As millions of Canadians prepare to turn their clocks back this weekend, a growing number of provinces and territories are moving to end seasonal time changes entirely. While Quebecers will still adjust their clocks, the provincial government has signaled intentions to abolish the practice as early as next year, following the lead of jurisdictions like Alberta and British Columbia.

How will permanent time affect your health?

Transitioning away from seasonal shifts aims to reduce the biological disruption caused by sudden one-hour changes. However, the specific type of time chosen matters. Many provinces are opting for permanent daylight time, which keeps the sun available later in the evening but results in much later winter sunrises.

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Experts have raised several concerns regarding this shift:

  • Circadian Misalignment: The human biological clock relies on morning light to synchronize sleep-wake cycles.
  • Sleep Disruption: Moving morning light later can make it harder to wake up and easier to stay up late, creating a mismatch with social schedules.
  • Safety Risks: In places like British Columbia, health officials warned that darker morning commutes could discourage walking or cycling and increase risks for drivers.

What is the 'three-clock problem'?

Researchers describe the challenge of managing time as a conflict between three distinct systems. The solar clock follows the natural day-night cycle, the biological clock responds to environmental light, and the social clock dictates work and school schedules. When these three do not align, it can impact mental health and productivity.

According to Dr. Michael Antle of the University of Calgary, "our bodies follow the sun," meaning that a social schedule that ignores solar patterns can lead to significant physiological stress.

Which time is better for the body?

While many regions are choosing permanent daylight time, some research suggests a different path. A report in the Canadian Medical Association Journal indicates that permanent standard time may be better for human biology because it aligns more closely with natural rhythms. For northern regions, this choice is critical, as permanent daylight time can result in sunrises as late as 10 a.m. in some areas.

FAQ

Why are provinces ending the time change?

Governments aim to eliminate the health disruptions and "unnecessary constraints" caused by the biannual adjustment of clocks.

Does permanent daylight time have risks?

Yes, it can lead to darker morning commutes and a misalignment between the body's internal clock and the social schedule.