Every spring and fall, millions of us change our clocks and debate if Daylight Saving Time (DST) still makes sense. Some of us look forward to later sunsets. Others dread the groggy mornings and disrupted routines. But what does today’s research say about DST—does it actually help or hurt?
A Quick History Lesson
DST wasn’t invented for farmers. In reality, it became popular during World War I as a way for countries like Germany and the United States to save energy for the war effort. The idea is even older, but wartime made it mainstream. Since then, DST has been adopted, resisted, repealed, and brought back. Today, not every state or country observes it, and the debate about its value keeps going (Country Living).
Does DST Actually Save Energy?
Energy savings were the original selling point for DST, but modern studies punch holes in that argument. One of the most robust investigations, focused on Indiana, found that DST actually increased energy use by about one percent. People used less lighting in the evening, but that was more than offset by increased air conditioning and heating during the shifted hours (MIT study). Broader reviews also find the effect of DST on energy consumption is much smaller than advertised, and may be zero or even negative in some regions, especially with today’s modern energy demands (Current Biology).
What About Our Health?
This is where expert opinion starts to agree: biannual time changes are hard on the body. Loss of sleep and abrupt shifts in our schedules increase risks for heart attack, stroke, car accidents, and other health problems in the week after the clock change (Science.org). Medical research in journals like Circulation Research and PNAS continues to show that disrupting circadian rhythms—the 24-hour cycles that run our sleep, metabolism, and even stroke risk—has measurable health costs (Stroke in the Time of Circadian Medicine, Circulation Research; PNAS).
DST in particular pushes sunrise later in winter, especially in western parts of time zones, so kids and workers start their days in darkness for months. This lack of morning light messes with our internal clocks, making it harder to wake up, stay alert, and remain healthy, especially over time ([Weed & Zeitzer, 2025]; NSF Position Statement, 2024).
A major modeling study from Stanford combined local sunrise/sunset data and U.S. health records. The research predicts that eliminating the clock changes and adopting permanent Standard Time—not DST—would most improve health, with lower rates of obesity and stroke across the population ([Weed & Zeitzer, 2025, PDF]; NSF Position Statement, 2024).
Is There a Best Path Forward?
The National Sleep Foundation, along with many leading sleep and health researchers, favors permanent Standard Time because it aligns best with our biology. Their recommendations are grounded in research showing that our brains and bodies perform better when sunrise matches our daily routine. On the other hand, some citizens and policymakers prefer DST for the long, light evenings. The science leans toward public health over extra daylight for recreation, but the debate is still active.
Tips for Handling the Time Change
Until there’s a final decision, here are some practical ways to get through DST:
- Shift your bedtime early: Start going to bed 10 to 15 minutes earlier a few days before the switch so your body can adjust gradually.
- Get outside in the morning: Natural sunlight helps reset your inner clock.
- Cut caffeine and screens late in the day: This makes it easier to fall asleep in the new schedule.
- Be gentle with yourself: If you’re tired for a few days, don’t stress—it’s normal.
In Summary
Energy savings are minimal or even negative. The health effects of moving the clock are well-documented, with serious risks for sleep, heart, and brain health. The clearest scientific recommendation is to move toward permanent Standard Time. Still, communities remain divided.
Until things change, use these tips to make the shift as painless as possible and know that you are not alone in hoping for a better solution.
Sources:
- Does Daylight Saving Time Make Sense? Scientists Debate Pros and Cons — Science.org
- The History of DST — Country Living
- Does Daylight Saving Time Save Energy? — MIT / Review of Economics and Statistics
- Impacts of DST on Energy and Health — Current Biology
- Weed & Zeitzer, 2025, Circadian-Informed Modeling
- Stroke in the Time of Circadian Medicine — Circulation Research
- NSF Position on Permanent Standard Time, 2024
- Biological impacts of social clock policy — PNAS
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