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Why Experts Say Permanent Daylight Saving Time is Unhealthy

NOVA PBS Official | September 25, 2025



The misalignment of our internal clocks and the sun could result in a handful of heath concerns, experts say.

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Written by NOVA PBS Official

Comments

This post currently has 31 comments.

  1. @1017ts

    September 25, 2025 at 12:45 am

    I think we should end our day and start our evening as soon as possible, the sun setting earlier in the evening, making our day shorter, and starting our evening an hour sooner

  2. @MrJahka

    September 25, 2025 at 12:45 am

    If you prefer having sunlight at 6 am on your way to work instead of an hour after work you should be put in a reeducation camp.

    I’m sorry but this is nonsense for the vast majority of us beholden to shift work. Daylight saving time leads to more useful and used sunlight for most people.

  3. @NJSins8shn

    September 25, 2025 at 12:45 am

    I love my daylight saving time! I know when summer and winter are coming by date but the clock changing is like looking forward to a holiday or birthday for a cake. The symbolic gesture of the clock changing has a psychological impact on me.

  4. @JayS.-mm3qr

    September 25, 2025 at 12:45 am

    This is such nonsense!! People have different schedules and get up at different times. Also, people close their blinds and don't get morning sun either way. Lightness makes no difference when I get up. Going to standard time would mean 4:00 am sunrises. What a WASTE of daylight. What a quack theory that "light gets us up". Do they get up at 5am in summer because it's light? No! So why would making the sunrise even earlier do anything? It wouldn't! It's just a waste of light. Its so ridiculous how that one women talks like it doesn't matter that you'd be sleeping through the light. Lol!! You'd be MISSING IT!! Not gaining it with earlier sunrise.

  5. @jamesbraddy2408

    September 25, 2025 at 12:45 am

    Having lived in Alaska, our children…in winter…went to school in the dark, came home in the dark. They did just fine! Just the opposite in the summer. We adjusted. This is baloney.

  6. @KuchiniFallinFromDaSky

    September 25, 2025 at 12:45 am

    I'm in Washington state and the prospect of an hour more evening light is so much more appealing than more morning light, and I'm a morning person! The rationale with making daylight savings time permanent is clear to me in so far as the vast majority of people will benefit from more evening light than more morning light. Just think, how many people are actually up between 6:00 and 8:00 a.m. compared to people that are up between 5:00 and 6:00 p.m.? For social and economic reasons permanent DST is the obvious choice imo

  7. @nbuehster

    September 25, 2025 at 12:45 am

    I don't know when we first depended on clocks to tell us what time it is. But maybe (And I don't know how we would do this.) we should make it so the days have either more, or fewer, hours, and the hours would either be longer, or shorter,. (The same thing with minutes. Minutes would probably be 100 seconds, and hours would be 100 minutes.)

  8. @jannea4318

    September 25, 2025 at 12:45 am

    I want permanent STANDARD TIME, not permanent Daylight Savings Time. Among myriad other reasons, but not primarily, because the many parts of the world that eliminated biannual time changes, eliminated their countries' versions of daylight savings time.

  9. @lisazappala4381

    September 25, 2025 at 12:45 am

    People don’t Tahoe that the earth moves so they will get more daylight without changing the clock to savings time.
    I live in standard time all year although I live in a place that changed the clock. I sleep eat workout do everything at the same time of day all year round no matter what thethe clock says I get so sick trying to adjust all the time and I was more tired during the summer months following sprinting ahead so I stopped changing and I feel so much better

  10. @richardjarrell3585

    September 25, 2025 at 12:45 am

    If the differences between eastern and western points within a time zone are a health factor, we obviously should revert to local time, as we had before using railroads necessitated the invention of time zones.

  11. @geneparadis7888

    September 25, 2025 at 12:45 am

    Experts lie. I wonder why there are no experts claiming how permanent DST is healthier? At 1minute 17 sec in the video some one is saying some research suggest morning light the body releases cortisol? how can this be when most people set the alarm clock between 6am and 7 am when your in bed with the shade closed your not benefiting from day light…! So how can this research be true? not many benefit from morning light because most of us are in bed sleeping while it turns light out. You know summer time. Yet most of us greatly benefit with and extra hour of day light in the evening after work. Would be much easier for researchers to find how much healthier it would be to stay on Day Light Saving time all year long.

  12. @zippyducky1704

    September 25, 2025 at 12:45 am

    Do people not understand that the clock does not determine the light? The rotation of Earth and orbit around the Sun control that. The sunsets will be earlier in the winter even if we have DST or not.

  13. @GraniteStateVictoria

    September 25, 2025 at 12:45 am

    As someone who likes getting up early and going to bed early, I wish we had year round Standard Time. I'd love a 4 AM sunrise in June (I live in New Hampshire), much better than still being twilight at 10 PM. I like it being dark both when I go to bed and when I wake up. I'd go a step further and say we need to fix time zones, they're badly gerrymandered. We should have year round Standard Time and fix time zones, Indiana, Michigan, and Ohio should for example be on Central Time. Texas should example be on Mountain Time.

  14. @trull122

    September 25, 2025 at 12:45 am

    Humans had to get up before the sun for countless thousands of years. Internet wonks who muse from behind a keyboard at 3am are just first worlds snobs.

  15. @Vector_Ze

    September 25, 2025 at 12:45 am

    From numerous comments I've read on Quora, the number of people wanting permanent Standard Time vastly outnumber those of us who would prefer permanent Daylight Time. The one thing most of us agree on is a dislike of the switching back and forth, though that doesn't bother me. But, I live 11 miles (18 km) west of a Time Zone line. I'm on the eastern side of a Time Zone. I HATE that is is dark at 5 PM in the winter.

    Another factor that this clip didn't seem to address is latitude.

    In the Northern Hemisphere in winter, higher Latitudes have fewer daylight hours than lower latitudes. That is reversed in summer months, with lower latitudes receiving less than their northern friends on the same date. You can take this to the extreme by traveling north of the Arctic Circle and witnessing the Midnight Sun.

    Minneapolis and Lake Charles, Louisiana are at nearly the same longitude and Time Zone, but are 15° apart by latitude.

    In Minneapolis sunrise on 12/21 is 32 minutes later than in Lake Charles, and sunset is 43 minutes earlier. But, on 6/21 things are reversed, with Lake Charles having sunrise 46 minutes later than Minneapolis, and sunset 47 minutes earlier. Northern states have more daylight hours than southern in the winter, and fewer in the summer. Location, location, location.

    Latitude is a huge unmentioned part of the equation, and you can't legislate more hours of daylight. Lake Charles has 86 minutes more daylight on 12/21, and Minneapolis has 111 minutes more on 6/21. If a decision is ever enforced, either way, some people are not going to like it. As a southerner in the Central Time Zone only 11 miles from the Eastern Time Zone, and who is a night owl, and regardless of the season only sees sunrise if I haven't yet hit the hay, I'm all in for year around Daylight Time.

    Morning sunlight be damned, it's almost always daylight when I wake up. We poor nightowls. I'm often awake until 2 or 3 AM, and sleep til hours after sunrise, regardless of when that occurs. And what about people who are getting off work in the morning? We have a 24 hour economy. The video points out people in some locations driving to work in the dark (presumably in the morning), but says nothing about people driving home in the dark at 5 PM. In my lifetime, I have gone to work and gotten off work at all hours of the day, it makes no difference to me.

    This does strike me as a highly biased report. If the effort was made, it would be easy enough to find 'experts' who argue in favor of Daylight Time, and there were NONE. "One study says", is not adequate to conclude DT is "unhealthy".

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