Daylight Saving Time: Health Impacts and Regional Variations
As clocks spring forward this weekend, marking the start of Daylight Saving Time (DST) on March 10, 2025, Americans brace for the annual time shift. This transition, however, is not without its controversies, particularly regarding its impact on public health. Experts warn that the change can disrupt sleep patterns, leading to increased risks of heart attacks, strokes, and mood disturbances.
The debate over DST's utility and its health implications is reignited each year, with some states like Arizona choosing to opt out of the practice entirely. Arizona's decision to not observe DST, except on the Navajo Nation, underscores the regional variations in timekeeping across the U.S. This year, health professionals are more vocal than ever, urging individuals to prepare for the change by adjusting their sleep schedules gradually in advance.
Despite the health concerns, the tradition persists, driven by the belief that DST promotes energy conservation and boosts evening economic activity. As the nation adjusts its clocks, the conversation around DST's future continues, with some advocating for a permanent standard time to mitigate its adverse effects on health.
Detailed Daylight saving time explained
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What time do we lose an hour?
Daylight Saving Time begins in the U.S. at 2 a.m. on Sunday, March 9, 2025. Two bills in Congress, if passed, would make Daylight Saving Time permanent across the U.S.
Why is there a daylight savings time?
Why do we change the clocks? The U.S. has been observing daylight saving time since 1918, with the passage of the Standard Time Act, according to the U.S. Astronomical Applications Department. It was an effort to extend summertime daylight hours by pushing off sunset an hour.
Where does daylight savings happen?
As of 2025, DST is observed in most of Europe, most of North America and parts of Africa and Asia around the Northern Hemisphere summer, and in parts of South America and Oceania around the Southern Hemisphere summer. It was also formerly observed in other areas.
Are we losing or gaining an hour in March 2025?
Daylight saving time is the time between March and November when most Americans adjust their clocks ahead by one hour. We lose an hour in March (as opposed to gaining an hour in the fall) to make for more daylight in the summer evenings.
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