How to Shift Your Body Clock Before a Long-Haul Flight

Key Takeaways:

• Long-haul flights that jump time zones can interfere with your circadian rhythm, resulting in jet lag after you arrive.
• Shifting your body clock before flying can prevent the effects of jet lag by gently easing you into the new time zone.
• Hatch Restore can help you create a restful environment as you adjust your sleep schedule before a long-haul trip.

Jet lag can be one of the most annoying parts of travel. You land at your destination, ready to hit the ground running, and you’re suddenly hit with a wave of exhaustion and a general “off” feeling. That’s totally normal, and a sign your circadian rhythm is trying to figure out what time it is.

Luckily, jet lag doesn’t have to interfere with your trip. A few simple strategies to shift your body clock before flying can reduce the effects of jet lag, so you can feel rested and ready for whatever your trip has in store. Below, learn more about why jet lag happens, and how to adjust your circadian rhythm before travel.

Table of Contents

1. Why Adjusting Your Circadian Rhythm Before Travel Prevents Jet Lag
2. Jet Leg Prevention Tips to Shift Your Body Clock Before Flying
3. FAQs
4. References

Why Adjusting Your Circadian Rhythm Before Travel Prevents Jet Lag

Jet lag happens when your internal body clock, or circadian rhythm, is out of sync with the local time at your destination. Your circadian rhythm regulates your sleep-wake cycle along with many other biological processes, such as hormone release, body temperature, alertness, and digestion. Crossing several time zones quickly — especially on long-haul flights — doesn’t give your body enough time to adjust, which can lead to symptoms like trouble falling asleep, early waking, daytime fatigue, difficulty concentrating, and digestive upset.

Not all jet lag is the same. Traveling east generally causes more severe symptoms because it requires your body to fall asleep and wake up earlier than usual, which is harder for most people to do. Traveling west usually requires staying up later and sleeping in, which tends to be easier.

Gradually shifting your sleep schedule in the days before departure can help your circadian rhythm begin adapting before you even board the plane, reducing the mismatch between your body clock and your destination’s time zone. Pairing these schedule changes with strategic light exposure — seeking bright morning light when advancing your schedule or evening light when delaying it — provides one of the strongest signals to reset your internal clock and reduce the severity of jet lag.

Jet Leg Prevention Tips to Shift Your Body Clock Before Flying

If you’re planning a trip across time zones, here’s what to know about adjusting your circadian rhythm

Start Adjusting Sleep and Wake Time 3-5 Days Before Departure

A few days before your trip, begin shifting your bedtime and wake-up time closer to the schedule at your destination. Aim for small changes — ideally, about 15-30 minutes earlier or later each day — rather than trying to make a big adjustment all at once. Even a modest pre-trip shift can help your body clock start adapting before you travel, which may make jet lag symptoms less intense once you arrive.

Time Light Exposure Strategically

Light is one of the strongest cues your body uses to set your circadian rhythm, so timing it well can make a big difference. If you’re traveling east, getting bright light earlier in the day can help your body shift earlier. For westbound travel, evening light can help your body stay awake later. Limiting light at the “wrong” time — especially bright indoor light or screens close to your target bedtime — can help reinforce the new schedule.

Adjust Meal Timing to Match Destination

Another great way to help your body adjust is slowly switching your meal times to align with your destination. Eating breakfast, lunch, and dinner on the new schedule, even a day or two before you arrive, can give your body another timing cue, especially when paired with sleep and light changes. It can also help to be mindful of caffeine and alcohol before and during travel, because caffeine too late in the day can interfere with sleep and alcohol can disrupt sleep quality.

Prioritize Sleep on the Plane When Aligned With Destination Night

Not sure whether you should try to catch some mid-flight Zzzs? As a rule, try to sleep on the plane if your flight overlaps with nighttime at your destination. Treat that window like bedtime: Dim screen brightness, use an eye mask or earplugs, and avoid caffeine or heavy meals close to when you’re trying to sleep. If the flight lines up with daytime at your destination, it may be better to stay awake so you’re more ready for local bedtime after you arrive.

Reinforce the New Schedule Immediately Upon Arrival

Once you arrive, try to switch your schedule to local time as quickly as possible. Get light exposure during the day, and eat meals and go to bed according to your destination’s schedule (even if your body still feels like it’s in another time zone). Short naps can take the edge off if you’re exhausted, but keeping them brief and early in the day can make it easier to fall asleep at local bedtime.

Learn how to get better sleep with Hatch Restore.

Frequently Asked Questions

How many days before a long-haul flight should I start adjusting my schedule?

Most people benefit from starting about 3-5 days before departure, especially when crossing multiple time zones. Even small daily shifts can help your body adapt more smoothly.

Is it better to stay awake or sleep on an overnight flight?

It depends on your destination timing. In general, try to sleep on the plane if it aligns with nighttime at your destination, and stay awake if it aligns with daytime there.

Can melatonin help with jet lag prevention?

For some travelers, short-term melatonin use can support circadian adjustment when timed correctly. Because timing and dosage matter, it’s wise to consult a healthcare professional before using it regularly.

References

1. Ambesh, P., Shetty, V., Ambesh, S., Gupta, S. S., Kamholz, S., & Wolf, L. (2018). Jet lag: Heuristics and therapeutics. Journal of family medicine and primary care, 7(3), 507–510. https://doi.org/10.4103/jfmpc.jfmpc_220_17
2. Choy, M., & Salbu, R. L. (2011). Jet lag: current and potential therapies. P & T : a peer-reviewed journal for formulary management, 36(4), 221–231. https://pmc.ncbi.nlm.nih.gov/articles/PMC3086113/