{
  "id": 17427947,
  "title": "What permanent daylight saving time could mean for sleep, mood, and mental health",
  "url": "https://urgent.news/2026/10/31/what-permanent-daylight-saving-time-could-mean-for-sleep-mood-and",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-10-31T16:00:51.000Z",
  "source": {
    "name": "PsyPost",
    "slug": "psypost",
    "url": "https://www.psypost.org/what-permanent-daylight-saving-time-could-mean-for-sleep-mood-and-mental-health/"
  },
  "original_language": "en",
  "account": "Rising public frustration with twice-yearly clock changes has intensified as researchers examine how permanent daylight saving time could impact sleep, mood, and mental health. A policy analysis in CMAJ suggests that permanent standard time may better support winter sleep and biological rhythms than permanent daylight saving time. A separate review of studies on mental illness patients reached a similar conclusion. However, a large review of population health patterns indicates that both seasonal clock changes and summer daylight saving time have both harmful and beneficial effects, rather than uniformly being detrimental.\n\nWhile major sleep societies have advocated for permanent standard time adoption, North American governments have largely opted for permanent daylight saving time instead. In 2020, Yukon became the first jurisdiction to implement permanent daylight saving time, followed by British Columbia in 2026, Alberta, and the Northwest Territories in April 2026. The United States House of Representatives passed a bill in July 2026 to make daylight saving time permanent nationwide. However, public opinion does not align with this legislative push: a 2025 Gallup poll found that only 19% of Americans wanted to keep changing the clocks, while 48% preferred permanent standard time and 24% favored permanent daylight saving time.\n\nStandard time aligns 12:00 noon with solar noon, the moment when the sun is at its highest point along a time zone's central line of longitude. Daylight saving time shifts clocks forward by an hour in spring and returns to standard time in autumn, creating a one-hour shift from morning to evening sunlight without adding extra daylight. Both time systems interact with circadian rhythms, the internal 24-hour biological cycles that regulate sleep, alertness, hormone production, and cellular activity. The suprachiasmatic nucleus, a small cluster of nerve cells in the hypothalamus, coordinates these daily rhythms by resetting with morning daylight. Because the human master clock runs slightly slower than a 24-hour day, it relies on natural daylight to maintain its cycle.\n\nLam and colleagues from the University of British Columbia, Simon Fraser University, and Vancouver Coastal Health analyzed the long-term consequences of adopting a permanent time system in Canada. They examined winter and summer sunrise and sunset times in six major Canadian cities, reviewed research on biological rhythms, disease modeling simulations, and economic border studies, and analyzed the impact of countries that previously adopted permanent daylight saving time. The authors found that under permanent daylight saving time, winter sunrises would align with or after many school start times across most of Canada. For example, in Toronto, winter sunrise would shift from 7:51 a.m. to 8:51 a.m., while in Vancouver, it would move from 8:08 a.m. to 9:08 a.m.\n\nThe authors noted that political time zone boundaries often distort local solar time, demonstrating that Saskatchewan, despite observing Central Standard Time year-round, experiences light schedules similar to permanent daylight saving time due to its geographic proximity to Mountain Time. Moreover, clock policies have the most significant impact in mid-latitude regions, where most Canadians reside. High-latitude territories, such as Yukon, experience minimal winter daylight changes due to their brief daylight periods, rendering a one-hour shift relatively insignificant.\n\nProlonged winter morning darkness under permanent daylight saving time is expected to exacerbate social jet lag and increase susceptibility to seasonal mood disorders. Winter sleep, concentration, and energy dips are already prevalent among youth aged 12 to 17. Seasonal affective disorder, a form of winter depression characterized by a delayed body clock due to later morning light, affects approximately 1% to 3% of Canadians. Up to 15% of Canadians experience milder winter slumps in mood, sleep, and energy. These geographic patterns align with global prevalence trends, where seasonal affective disorder prevalence increases by 0.2 percentage points in regions with longer winter daylight.",
  "summary": "As lawmakers across North America move to end the twice-yearly ritual of changing the clocks, three new papers highlight a complex debate over how clock shifts and permanent time systems affect health.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 2,
    "also_reported_by": [
      {
        "outlet": "Futurity",
        "title": "Why permanent daylight saving time is a bad idea for health",
        "url": "https://urgent.news/2026/10/28/why-permanent-daylight-saving-time-is-a-bad-idea-for-health",
        "published": "2026-10-28T20:33:11.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}