Ending the clock changes makes sense. Locking the country into darker mornings does not. The medical case favors permanent standard time.
Congress is once again trying to sell permanent daylight saving time as a win for public health. This framing does not hold up against medical evidence. Eliminating the twice-a-year clock change makes sense. However, locking the country permanently into a later, darker morning does not. The healthier option is permanent standard time; this system keeps noon closer to the sun’s highest point and provides the body with more morning light needed to set its internal clock.
This distinction is significant. Politicians keep mixing two separate questions: Should the clock stop changing? And which clock should be permanent? Sleep doctors overwhelmingly say yes to the first question and standard time to the second. Congress is pushing the opposite choice while openly promoting longer shopping, tourism, and recreation hours. That is not a medical agreement. It is an economic choice wrapped in health language.
Congress Is Ignoring the Health Alternative
The Sunshine Protection Act has moved toward a House vote after the House Energy and Commerce Committee approved it 48 to 1. Supporters claim locking the clock would improve sleep, road safety, and the economy. However, lawmakers turned down an effort to bring a permanent-standard-time option to the floor, even though that plan would also end the disruptive clock changes.
This rejection reveals the weakness in the health argument. If health were truly the priority, Congress would seriously consider the clock favored by the American Academy of Sleep Medicine, American Medical Association, National Sleep Foundation, Sleep Research Society, and leading circadian researchers. Instead, the idea of permanent standard time was set aside as permanent daylight saving time moved ahead.
This does not mean every supporting politician is personally indifferent to health. It indicates that Congress is treating medical advice as secondary. Lawmakers are choosing the option that sounds better, polls better, and promises more evening commerce.
The bill’s supporters state the quiet part out loud. Advocates expect brighter winter evenings to “spur more economic activity.” Committee leaders have promoted extra time for concerts, sporting events, outdoor recreation, and retail customers. Florida backers often highlight tourism and golf. While these may be legitimate economic interests, they do not show that permanent daylight saving time is biologically healthier.
Morning Light Is a Biological Requirement
Human beings do not operate solely based on clocks on walls. Our brains and organs follow circadian rhythms heavily influenced by light and darkness. Morning light advances and stabilizes the body clock. Bright evening light delays it, causing sleep to come later, even when school and work still begin early.
Dr. Phyllis Zee, chief of sleep medicine at Northwestern University’s Feinberg School of Medicine, describes circadian misalignment as the point “when your internal body clocks fall out of sync” with solar and social time. Dr. Beth Malow, a Vanderbilt University professor of neurology and pediatrics, has stated that daylight saving time is “like living in the wrong time zone” for most of the year.
A peer-reviewed review in Frontiers in Physiology explains the mechanism clearly: daylight saving time increases the mismatch between the social clock and the body clock. It does not create an extra minute of sunlight. It only shifts society to begin school, work, and commuting one hour earlier compared to the sun.
That is the key deception in the term “saving daylight.” Nothing is saved. Morning light is moved on the clock to the evening, where businesses hope people will spend it.
Dr. Eva Winnebeck, a chronobiology researcher at the University of Surrey, succinctly summarized the biological issue: “Morning light is the big signal.” Dr. Natalie Dautovich of the National Sleep Foundation similarly states that standard time best matches natural circadian rhythms and the sun’s timing.
The Medical Consensus Is Not Ambiguous
The American Academy of Sleep Medicine is clear: seasonal clock changes should end in favor of fixed, year-round standard time. The Sleep Research Society has reached the same conclusion, along with major chronobiology organizations whose members study how light affects sleep, hormones, metabolism, mood, cardiovascular function, and cognition.
The harm from the spring clock change is already well documented. Research summarized by Johns Hopkins sleep expert Dr. Adam Spira and others has linked it to shorter sleep, reduced alertness, impaired work engagement, more traffic crashes, and temporary increases in cardiovascular events. Adolescents are especially at risk because puberty naturally shifts sleep timing later. Permanent daylight saving time would give them less morning light and more evening light, opposing both their biology and efforts to start school later.
Dr. Anita Shelgikar, a University of Michigan neurologist and president of the American Academy of Sleep Medicine, said that “permanent standard time best aligns our internal clock with the world around us.” That is a public health recommendation, not a lifestyle choice.
A 2025 Stanford modeling study went even further. Researchers estimated that permanent standard time could reduce the national prevalence of obesity by about 2.6 million cases and stroke by roughly 300,000 cases compared to the current switching system. Permanent daylight saving time also performed better than changing clocks, but standard time showed a greater modeled health benefit.
These numbers should not be treated as settled predictions. The model relied on assumptions about schedules and light exposure, and a 2026 methodological critique challenged part of its geographic calculation. Honest reporting requires this caution. However, the broader conclusion does not depend on one model. It is supported by decades of circadian research showing that morning light generally synchronizes our clocks, evening light generally delays them, and chronic misalignment has health costs.
Follow the Money, Not the Sun
Permanent daylight saving time has strong commercial appeal. Golf courses can sell later tee times. Restaurants, malls, sporting venues, and tourist businesses gain another bright hour after the regular workday. The golf industry has openly supported longer daylight-saving seasons because evening light means more rounds and revenue.
There is nothing wrong with businesses wanting customers. The problem arises when lawmakers present an economic-stimulation policy as a medically superior choice.
Energy savings are also much less certain than the political pitch suggests. Modern research has shown mixed regional effects, with reduced evening lighting potentially offset by darker mornings, heating needs, and greater evening air-conditioning use. Yale economist Matthew Kotchen’s recent work indicates the national electricity effect may be nearly neutral. Congress should stop presenting a disputed energy claim as settled fact.
Even the economic argument is incomplete. Poor sleep carries its own high costs through absenteeism, reduced productivity, errors, accidents, and chronic disease. A clock that encourages later biological timing while keeping early social schedules can impose costs that are not evident on a golf course’s revenue statement.
America Already Ran This Experiment
The United States adopted year-round daylight saving time during the 1970s energy crisis. The promise sounded familiar: save energy and enjoy more usable evening light. The reality included dark winter mornings, public anger, and children going to school before sunrise. Congress ended the experiment early in 1974.
Today’s proposal is not new. It is a rebranding of a policy the country abandoned after living with its effects.
Ending clock changes is sensible. Permanent daylight saving time is not the only option, nor is it the healthier choice. Permanent standard time removes the biannual disruption while keeping better alignment between the sun, the body, and the clock.
Congress can prioritize evening consumption if it wishes. It should at least be honest about the trade-off. This is not primarily a health reform. It is a business-friendly decision to shift usable daylight to when consumers are not working.
The sun does not care what Congress calls noon. The human body does.
Sources and Research
- Reuters, July 13, 2026: U.S. lawmakers debate permanent daylight saving time
- Reuters, July 9, 2026: House vote and economic arguments
- American Academy of Sleep Medicine position statement, Journal of Clinical Sleep Medicine
- Sleep Research Society position statement, SLEEP
- Roenneberg, Winnebeck and Klerman, Frontiers in Physiology, 2019
- Washington Post: Why daylight saving time is worse for the body than standard time
- Washington Post: Stanford modeling study on obesity and stroke, 2025
- Proceedings of the National Academy of Sciences: Circadian-informed modeling study
- Martin-Olalla and Mira, 2026 methodological critique
- Associated Press: Golf industry’s support for daylight saving time
- Wall Street Journal: Mixed evidence on energy savings
- TIME: Health effects of daylight saving time