Manitoba is set to adopt permanent daylight saving time (pDST) on November 1, following a survey in which 92% of 72,000 residents voted to end seasonal clock changes. But sleep and circadian rhythm experts are pushing back. The scientific consensus, backed by sleep and chronobiology societies worldwide, is that permanent standard time (pST) is the healthier choice because it better aligns with the body's master circadian clock, which depends on morning light to stay in sync.

Experts warn that pDST will shift light exposure in ways that disrupt sleep, worsen mood, and impair cognition — particularly in winter. Adolescents face outsized risks, as their naturally delayed sleep cycles will be pushed even further out of sync with school schedules, threatening academic performance and mental health. Countries including the US, Russia, and Chile have previously tried pDST and reversed course after public backlash over dark winter mornings and safety concerns.

Key Takeaways:

• Permanent standard time is recommended by all major sleep and chronobiology societies
• pDST is expected to increase insomnia, morning sleepiness, and winter depression
• 1 in 5 Canadians already experiences seasonal affective disorder or winter blues
• Teens are especially vulnerable — academic performance and suicide risk are both affected
• Clinicians should proactively monitor patients for circadian-related health impacts

Why it matters: As more provinces lock in pDST, healthcare providers need to anticipate a potential rise in sleep, mood, and cognitive complaints — and stay informed on the evidence so they can support their patients through the transition.