Daylight Saving Time Ends: How to Reset Your Body Clock

At 2 a.m. on Sunday, November 1, your phone will quietly jump back to 1 a.m. You get an extra hour. Then on Monday the sun sets before 5 p.m. in cities like Boston, New York, and Chicago, you are wide awake at 5:30 a.m., and by Wednesday you feel oddly flat for no reason you can name.

That slump is real, and it is predictable. Daylight saving time ends on November 1, and sleep researchers say the body takes about a week to catch up to any clock change, including the one that supposedly gives you time back. Meanwhile, Congress is closer than it has been in years to ending the switch for good, and most people have no idea which version of "permanent" is on the table.

Below you will find what actually happens to your body when the clocks fall back, a four-day plan to reset your sleep before Sunday, and what the bill sitting in the Senate would mean for your mornings.

Daylight Saving Time Ends November 1: Who Changes and Who Does Not

Federal law sets the schedule. Since 2007, under the Energy Policy Act of 2005, daylight saving time has run from the second Sunday in March to the first Sunday in November. This year that lands on November 1.

Most phones, laptops, and smart speakers update on their own. Your car dashboard, microwave, oven, and any wall clock will not. Neither will the timer on a coffee maker or a thermostat schedule that was set by hand.

Not everyone moves:

• Hawaii stays on standard time all year.
• Arizona stays on standard time, except the Navajo Nation, which observes daylight saving time.
• Puerto Rico, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands do not change either.

If you work with people in Phoenix or Honolulu, your meeting times shift relative to them on November 2. Our time zone converter shows the new gap before you send that Monday invite.

Why the "Extra Hour" Is Not Free

Gaining an hour sounds like the easy direction, and it is easier than losing one in March. But your body does not run on the clock on the wall. It runs on an internal clock, set mostly by morning light, that expects to wake and get hungry at the same times it did on Saturday.

On Sunday morning that internal clock says 7 a.m. while the wall says 6 a.m. Many people simply wake up early, lose the "extra" hour to lying awake, and then fight drowsiness in the evening when the wall clock says it is too early for bed.

The American Academy of Sleep Medicine says moving into or out of daylight saving time disrupts sleep for about 5 to 7 days, and the effects hit hardest in people who were already sleep deprived. That is most adults. The academy recommends at least 7 hours of sleep on the nights before and after the change, and extra caution with driving and other tasks that need full alertness for a week afterward.

The darker commute

The fall change also moves an hour of daylight out of the evening rush. In Detroit, sunset drops from about 6:20 p.m. on Saturday to about 5:20 p.m. on Sunday. Many people now drive home in the dark for the first time in months.

That matters for anyone on foot. An often-cited Carnegie Mellon analysis found that pedestrians were about three times more likely to be struck and killed by a car in the weeks right after the fall time change, compared with the weeks before it. The data is older, but the cause has not changed: drivers are suddenly facing dusk at the hour when sidewalks are busiest.

A Four-Day Plan to Reset Your Body Clock

You do not have to absorb the full hour on Sunday. Spread it out, and most people barely notice the change. Start on Wednesday, October 28.

1. Wednesday: go to bed and wake up 15 minutes later than usual. If you sleep 10:30 p.m. to 6:30 a.m., shift to 10:45 and 6:45.
2. Thursday: add another 15 minutes, to 11:00 and 7:00.
3. Friday: 11:15 and 7:15.
4. Saturday: 11:30 and 7:30. When the clocks fall back overnight, that 7:30 wake-up becomes 6:30 on Sunday, which is exactly your normal time.

Move meals with you by the same 15 minutes a day. Your gut has its own clock, and eating on Saturday's schedule tells it to stay put.

Light is the other lever. Get outside within an hour of waking on Sunday and Monday, even on a gray day. Outdoor light, even overcast, is far brighter than indoor lighting and is the strongest signal your internal clock reads. In the evening, do the reverse: dim the lights and cut screen brightness in the hour before bed.

If you cannot shift your schedule because of an early shift or school drop-off, at least protect Saturday night. Go to bed at your usual time by the old clock, and use the extra hour to sleep, not to stay up. For a deeper look at how much sleep quality affects your long-term health, see why researchers now rank sleep ahead of diet and exercise for lifespan.

Kids, pets, and older adults

Young children and dogs have no idea what a clock is, which is why they are up at 5 a.m. on Monday. The same four-day shift works for them, in smaller steps of 10 minutes if needed. Older adults, who often wake early already, may find the change pushes their wake time uncomfortably early. For them, bright light in the late afternoon helps more than morning light, because it nudges the internal clock later.

Permanent Daylight Saving Time: What the Senate Bill Would Change

On July 14, the House passed H.R. 139, the Sunshine Protection Act, by a vote of 308 to 117. Republicans backed it 193 to 22. Democrats split 114 to 95. The bill would end the twice-yearly switch by keeping clocks on daylight saving time all year.

It is not law. The bill still needs to pass the Senate and be signed by the President, and the Senate has been here before: a 2022 version passed that chamber unanimously and then died in the House. Until something passes both, you will keep changing clocks in March and November.

Here is where it gets interesting. Sleep scientists mostly agree the switching should stop, but they want the opposite fix. The American Academy of Sleep Medicine, along with the American Medical Association and the National Sleep Foundation, supports permanent standard time, the setting we return to on November 1.

The sunrise math

Permanent daylight saving time keeps the bright summer evenings, but the cost shows up on winter mornings. Take three cities in early January:

• Detroit: sunrise is about 8:00 a.m. now. Under permanent daylight saving time, it would be about 9:00 a.m.
• Indianapolis: about 8:05 a.m. now, about 9:05 a.m. under the bill.
• Seattle: about 7:55 a.m. now, about 8:55 a.m. under the bill.

A child catching a 7:15 a.m. bus in Detroit would board in full darkness, close to two hours before sunrise, and the mornings would stay dark at that hour from November into February. The U.S. tried exactly this in January 1974, during the energy crisis. Public support collapsed within months, largely over children going to school in the dark, and Congress reversed it that October.

Researchers at Stanford modeled all three options in a study published in PNAS. Their county-by-county model estimated permanent standard time could prevent about 300,000 strokes a year and cut obesity by about 2.6 million people compared with today's switching. Permanent daylight saving time also beat the status quo, just by less. The percentages are small, and the model assumes ideal sleep habits, but across 330 million people small shifts add up.

Frequently Asked Questions

When does daylight saving time end this year?

Daylight saving time ends at 2 a.m. local time on Sunday, November 1. Clocks move back one hour to 1 a.m. It will start again on the second Sunday in March, when clocks move forward.

Do we gain or lose an hour when we fall back?

You gain an hour. Sunday, November 1, lasts 25 hours on the clock, so you can sleep an hour longer that night. Your body may still wake at its old time, which is why a gradual shift helps.

How long does it take to adjust to the time change?

The American Academy of Sleep Medicine puts it at about 5 to 7 days. People who were already short on sleep tend to take longer. Shifting your schedule by 15 minutes a day before the change shortens the adjustment.

Is daylight saving time going to be permanent?

Not yet. The House passed the Sunshine Protection Act in July, but it still needs Senate approval and the President's signature. Until both happen, clocks keep changing twice a year.

Use the Week, Not Just the Hour

The clock change takes one second. Your body needs a week. Start shifting your schedule on Wednesday, get outside early on Sunday and Monday, and give yourself extra margin on the road once the evening commute turns dark.

Then keep an eye on the Senate. If the Sunshine Protection Act passes in its current form, November 1 could be one of the last times you ever fall back, and your winter mornings would get an hour darker for good. Whichever way it goes, the people who sleep best through it will be the ones who planned for the week instead of just enjoying the extra hour.