Most people take about a day or two to adjust to daylight saving time, but your body’s internal clock can feel off for up to a week if you don’t prepare. The key is shifting your schedule gradually before the clocks change, then using light exposure strategically to help your circadian rhythm catch up. Here’s how to make both the spring and fall transitions smoother.
Why an Hour Matters More Than You Think
Losing or gaining a single hour sounds trivial, but your circadian rhythm is surprisingly rigid. It’s governed by light exposure, meal timing, and deeply ingrained habits, so even a 60-minute shift can disrupt sleep quality, alertness, and mood for several days. The spring transition (“spring forward”) is harder on the body because you lose an hour of sleep. A study of hospital admissions across Michigan found a 24% increase in heart attacks on the Monday following the spring time change. The fall transition is physically easier since you gain an hour, but it can still leave you waking too early and feeling sluggish in the evening.
The American Academy of Sleep Medicine has formally called for the U.S. to eliminate seasonal time changes entirely, citing harms to health and safety. Until that happens, preparation is your best tool.
Start Shifting Your Schedule a Few Days Early
The most effective strategy is incremental adjustment. Rather than absorbing the full hour all at once, shift your bedtime and wake time by 15 to 20 minutes per night over the three to four days before the clocks change.
For the spring transition, that means going to bed and waking up slightly earlier each day. If you normally sleep at 11:00 PM, try 10:45 three nights before, 10:30 two nights before, and 10:15 the night before the change. By the time the clocks jump forward, your body has already covered most of the distance. For the fall transition, do the opposite: stay up a bit later and wake a bit later each day to delay your internal clock.
Shift your mealtimes along with your sleep schedule. Your digestive system sends timing signals to your brain, so eating dinner 15 minutes earlier (or later, in fall) reinforces the adjustment you’re making with sleep.
Use Light Exposure Strategically
Light is the strongest signal your circadian clock responds to. In the spring, get outside in the morning as soon as possible after waking. Bright morning light tells your brain to shift its clock earlier, which is exactly what you need when you’ve lost an hour. Even 20 to 30 minutes of natural daylight makes a noticeable difference.
In the fall, the goal is the opposite. You want to delay your internal clock so you don’t start waking at 5:00 AM. Indiana University School of Medicine recommends spending time outdoors in the evening for the few days before and after the fall time change. Evening light exposure pushes your body’s clock later, helping you stay asleep until your normal wake time.
Indoors, dim the lights in the evening during the spring transition and avoid bright screens close to bedtime. In the fall, keeping lights on a bit later can help you stay up until your adjusted bedtime.
Watch Your Caffeine Window
Caffeine lingers in your system far longer than most people realize. Its half-life is about five to six hours, meaning half the caffeine from your 3:00 PM coffee is still circulating at 9:00 PM. During the adjustment period, cut off caffeine at least 10 hours before bedtime. Some people are slower metabolizers and need an even longer buffer. If you normally sleep at 11:00 PM, your last cup should be no later than 1:00 PM.
This matters more than usual during the time change because your sleep is already lighter and more fragile. Even a moderate amount of caffeine that you’d normally tolerate can push your already-disrupted sleep over the edge.
Foods That Support the Transition
Certain nutrients help your body produce melatonin naturally. Foods rich in tryptophan, the amino acid your body converts into serotonin and then melatonin, can support sleep quality during the adjustment. Turkey, eggs, nuts, seeds, and dairy are all good sources. Tart cherry juice is one of the few foods that contains small amounts of melatonin itself.
Avoid heavy meals within two to three hours of bedtime. A large dinner forces your digestive system to work when your body is trying to wind down, which can fragment sleep. A light snack with tryptophan-rich food is a better choice if you’re hungry before bed.
Adjusting Young Children
Kids, especially toddlers and babies, are more sensitive to schedule changes because their routines are more tightly structured. The best approach is to stretch the adjustment over five or six days to prevent overtiredness and bedtime battles.
For the spring transition, move bedtime 15 minutes earlier each night. If your child usually goes to bed at 7:30 PM, shift to 7:15, then 7:00, then 6:45, then 6:30. Adjust wake time forward at the same pace. By the time clocks spring forward, 6:00 AM becomes 7:00 AM on the new clock, and 6:30 PM bedtime becomes 7:30 PM. Nap times should shift in the same 15-minute increments to keep the whole day consistent.
A sample schedule for the spring change looks like this:
- Day 1: Wake 6:45 AM, nap 11:45 AM, bedtime 6:45 PM
- Day 2: Wake 6:30 AM, nap 11:30 AM, bedtime 6:30 PM
- Day 3: Wake 6:15 AM, nap 11:15 AM, bedtime 6:15 PM
- Day 4: Wake 6:00 AM, nap 11:00 AM, bedtime 6:00 PM
- Day 5 (clocks change): Wake 7:00 AM (new time), nap 12:00 PM, bedtime 7:00 PM
For the fall transition, reverse the direction: push bedtime 15 minutes later each night. Keep the lights on a bit longer in the evening and let morning light in gradually to help your child’s body adjust.
The First Few Days After the Change
Even with preparation, the first Monday after the time change is when most people feel it hardest. Give yourself extra time in the morning so you’re not rushing. If possible, avoid scheduling anything demanding early on that first Monday.
Stick to your new schedule rigidly for the first week. It’s tempting to sleep in on the weekend following the change, especially in spring, but irregular wake times confuse your circadian rhythm and extend the adjustment period. Wake up at the same time every day, even if you feel groggy. Your body will typically lock into the new rhythm within three to five days if you’re consistent with wake time, light exposure, and meal timing.
Exercise during the day also helps, but avoid intense workouts within two to three hours of bedtime. Physical activity raises your core body temperature, and your body needs to cool down before it can fall asleep efficiently. A morning or lunchtime workout reinforces your new schedule by boosting alertness when you need it most.