Permanent Daylight Saving Time Could Harm Sleep and Mental Health, Analysis Says
3 hours ago
- Canadian health researchers recommend permanent standard time over permanent daylight saving time due to health benefits.
- Permanent daylight saving time would delay winter sunrises, worsening sleep, mood, and mental health, especially for those with early schedules.
- The body's internal clock requires morning light to stay synchronized; permanent DST disrupts this by shifting light later.
- Seasonal affective disorder affects 1-3% of Canadians, with milder symptoms in up to 15%; morning light therapy is an evidence-based treatment, but DST opposes it.
- Permanent standard time has drawbacks like earlier summer sunrises and winter sunsets, which can be mitigated with blackout curtains and public education.
- Permanent DST would require broader measures such as better street lighting, later school start times, and monitoring of health impacts.
- Governments are urged to monitor consequences including school absenteeism, mental health, injuries, and physical activity, with attention to disparities.