The perennial debate over whether society should continue shifting clocks twice a year, adopt permanent daylight saving time, or transition to permanent standard time continues to draw sharp focus from sleep medicine professionals, chronobiologists, and lawmakers alike. For years, professional sleep organizations have maintained a consistent and scientifically grounded position: permanent standard time aligns far more harmoniously with human circadian physiology than either permanent daylight saving time or the alternating bi-annual system currently utilized across the vast majority of the United States, with the notable exception of Arizona. As a member of one of these professional organizations and having closely reviewed their accumulated scientific arguments, the case for permanent standard time grows increasingly compelling.
This debate gained fresh urgency with the release of a study shared with journalists, which sought to quantify the real-world logistical and safety impacts of the proposed "Sunshine Protection Act." If passed by the Senate and signed into law, the legislation would have established permanent daylight saving time nationwide. To evaluate the tangible consequences of such a shift, researchers Rodríguez Ferrante and colleagues at the University of Washington calculated the sheer volume of dark-morning student commutes to school that would occur under permanent daylight saving time. Their findings estimated that number to be roughly one billion.
Central to the researchers’ argument against permanent daylight saving time was an exhaustive analysis of a decade of national fatal crash records. The data revealed a troubling correlation: significantly higher odds of pedestrian involvement in traffic crashes during dark mornings compared to light mornings, with an overall odds ratio of 1.77. For school-aged children between the ages of 5 and 18, the risk factor was even more pronounced, registering an odds ratio of 2.22. These sobering statistics underscored why child safety—particularly for young students waiting in the pre-dawn hours at bus stops and traveling to school in buses and passenger vehicles—became a primary point of contention and concern for several senators evaluating the legislation.
As citizens across the country grapple with the physiological fallout of the autumn time change, the personal and biological toll of clock manipulation comes to the forefront once again. Adjusting to the abrupt shift, even when gaining an hour of sleep in the fall, disrupts daily rhythms. After several days following a time change, many individuals continue to experience shifts in their internal schedules, such as growing sleepy earlier in the evening and waking up earlier in the morning. Age plays a significant role in this transition. Older adults often find that their circadian clocks adjust at a considerably slower pace compared to younger populations.
Biological research highlights that both infants and older persons experience heightened difficulty adjusting to abrupt time changes. The underlying physiology involves complex neurochemical and hormonal mechanisms that govern the human internal clock, making swift adaptation elusive for a large portion of the population. Furthermore, the direction of the time change matters immensely. The traditional "spring forward" transition proves markedly more difficult for evening-type individuals, colloquially known as "night owls," than for morning-type individuals, known as "larks," because evening types must forcefully override their natural biology to wake up earlier.
Reflecting on the long history of human attempts to measure, regulate, and manipulate time reveals fascinating historical parallels. Turning back the pages of American history uncovers a striking entry in an 18th-century newspaper. On Tuesday, October 30, 1787, readers of the New York Packet perused the front page to find an advertisement for an almanac bundled with tables predicting the "Rising and Setting of the Sun," the "Judgment of the Weather," and the "Length of Days and Nights." This publication was none while Benjamin Franklin’s famed Poor Richard’s Almanack.
While other almanacs containing astronomical and meteorological data circulated in early America, Franklin’s work stood out as the most widely read secular book of its era, second overall only to the Bible. It is an intriguing exercise to ponder what Benjamin Franklin, a noted polymath and inventor, might have thought about modern efforts to alter timekeeping conventions through legislative clock changes, and which of the three primary alternatives—permanent standard time, permanent daylight saving time, or the current alternating system—he might have supported. Among Franklin’s many brilliant innovations was the clock, and it is a safe assumption that his mechanical ingenuity could easily have engineered a mechanism to automatically adjust for yearly time shifts, sparing modern society the recurring debate over circadian health and public safety.
