n a recent trip to Tucson, I heard zero complaints about a pending hour of lost sleep. On March 10, 2024—when most clocks across the country will advance one hour for daylight saving time—no one in that city will be scrambling to remember how to adjust the time on their microwaves or car dashboards.
A symphony of tiny timekeepers tick—metaphorically, of course—throughout your body. Circadian clocks keep time everywhere from your liver and lungs to your nose and toes. They rely on the planet’s predictable patterns to stay harmonized and, in turn, to keep your brain and body running optimally. The most powerful of these cues is the rising and setting sun.
These same organizations recommend adopting permanent standard time. Because we tend to debate the concurrent issues separately, however, we may easily overlook how permanent daylight saving time would erase the published gains in attendance, grades, and test scores from delaying school start times. In Seattle, locking the clock on daylight saving time would push sunrise to after 8:30 a.m. for more than two months of the year—cancelling out the recent bell changes made by Seattle public schools.
Tucson’s geography is a boon for residents’ biological timekeeping. Its proximity to the equator—especially compared to my hometown of Seattle—keeps daylengths relatively consistent across the seasons. The days are also consistently bright, and the nights consistently dark. A friend who recently moved from Seattle to Tucson said he rarely veers from his new daily schedule of early mornings and early nights. In the summer, Tucsonans rise early to avoid the heat.
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