Daylight Saving Time (DST) starts this weekend. Early Sunday morning, the clocks jump forward one hour.

That sounds small. Your body disagrees.

A lot of us treat this like a minor inconvenience, like a low battery chirp from a smoke detector. Annoying, but not serious. The problem is that sleep and circadian rhythms are not “nice to have.” They are part of our fundamental wiring. When we suddenly shift the clock, we do not just change what time the meeting is. We change how your brain and body try to run the day.

What DST Actually Does Inside Your Body

Your body runs on a 24-hour timing system called your circadian rhythm. The strongest “reset button” for that rhythm is light, especially bright morning light. When we switch to DST in spring, two things happen at once. First, we often lose sleep. Many people go to bed at the same time by habit but have to wake up earlier by the clock. That creates instant sleep debt, and sleep debt has real effects on attention, mood, cravings, and reaction time. Second, the light signal changes in a way that can confuse the body clock. After the switch, mornings are darker and evenings are lighter. Darker mornings mean less of the early light that helps your brain lock in “morning mode.” Lighter evenings can delay the release of melatonin, the hormone that helps your body get sleepy and stay asleep. The result can feel like a form of jet lag, sometimes called “social jet lag,” where your internal clock is out of sync with the external schedule you are expected to follow.

 This is why the spring change can lead to a few predictable complaints: trouble falling asleep, trouble waking up, feeling foggy, and feeling like your patience has a shorter fuse than usual. It is not just in your head. It is in your hormones, your nervous system, and your sleep architecture.

Sleep disruption can also ripple into other systems. Even a modest sleep loss can raise stress signaling, affect blood pressure, increase inflammation markers, and interfere with glucose regulation in some people. It can also nudge appetite hormones in the wrong direction, which is one reason people often notice stronger cravings after poor sleep.

Health and Safety Risks Worth Remembering

Researchers have found associations between the spring DST transition and short-term increases in problems like drowsy driving and workplace injuries. There is also recurring attention on heart risk. Some studies and health system summaries report a noticeable spike in heart attacks on the Monday after the spring change, often described as around a 20 to 25 percent bump. The exact number varies by study, but the pattern is consistent enough to take seriously, especially for people already at higher cardiovascular risk.

Mental health can be affected too. When sleep gets disrupted, mood can follow. Some people notice increased anxiety, irritability, or feeling down in the week after the change. If you already live with anxiety, depression, insomnia, or bipolar disorder, the combination of sleep loss and shifted light cues can be a bigger deal.

None of this is meant to scare you. It is meant to explain why one hour isn’t “only one hour.”

The Movement to Create One Standard Time (less sun, sigh!

Because the body clock follows the sun, many sleep and circadian experts argue that permanent standard time is the better match for human biology. The American Academy of Sleep Medicine has taken the position that permanent standard time best aligns with circadian health, and Stanford Medicine has also highlighted permanent standard time as the healthier option compared with permanent DST.

The key issue is morning light. Morning light is the anchor. When we choose a clock system that creates darker mornings for more of the year, it can become harder for many people to get the light their brains need to time sleep properly. This is especially true in northern states and for teens, whose natural sleep timing already runs later.

Why Standardized Time Hasn’t Happened Yet

If you feel like you’ve heard “they’re getting rid of DST” for about ten years, you are not imagining it. There have been repeated efforts to stop the clock changes, but there is disagreement about what we should switch to. Also, rules about time change in the US make it complicated.

States are allowed to stop observing DST and stay on standard time year-round. That is why Hawaii and most of Arizona do not change clocks.

What states cannot do on their own is move to permanent DST. That requires federal action. Many states have passed laws saying they want permanent DST, but those laws are often written to take effect only if Congress changes the rules.

At the federal level, proposals like the Sunshine Protection Act have aimed to make DST permanent. At the same time, as we mentioned above, many medical and sleep organizations argue that if we pick one, standard time is the healthier choice. You may also see occasional “compromise” ideas, like a permanent 30-minute shift, which is creative, but would still be a big national coordination project.

So yes, there is momentum to stop the switching. The debate is mostly about which time we should lock in.

What to Do Now to Beat the Clock Change

If you can start now, shift bedtime earlier by 15 to 20 minutes for a couple of nights. This is the gentlest way to reduce the shock on Sunday.

On Sunday and Monday, get outside soon after you wake up if possible. Morning light helps your brain re-time itself faster.

In the evening, treat bright light like a stimulant. If you can dim the house a bit after dinner and reduce screen time right before bed, it makes it easier for melatonin to do its job.

And please take drowsiness seriously, especially when driving early in the week. If you are struggling to stay alert, that is a real safety signal, not a character flaw.

Bottom Line

The spring DST change can affect sleep, hormones, mood, and safety because it changes both your schedule and your light exposure. The best defense is simple and boring, which is exactly what we want from a health plan. Ease bedtime earlier, get morning light, and protect your evenings for a few days. Please be sure to listen to your body. DST may cause drowsiness and it should be considered in the same way as certain drowsy-inducing medications. For now, be happy in the knowledge you’ll get that hour of sleep back in the fall!