If you’ve ever stepped off a long-haul flight into some far away location feeling slightly detached from reality and downright weird, you already know jet lag is not just “being tired.” It’s disorienting. Your body feels out of sync with your surroundings, and no amount of sheer willpower seems to fix it.
That’s because jet lag is not a mindset problem. It’s a biological one.
Circadian rythm is the culprit
At the center of it all is your circadian rhythm — your internal 24-hour clock. Deep within the brain is a small structure called the suprachiasmatic nucleus (mercifully abbreviated SCN), which regulates sleep, alertness, hormone release, digestion, and even body temperature. Its primary cue is light. When your eyes detect sunlight, signals travel to this internal clock and tell it what time it is.
The trouble begins when you cross multiple time zones faster than your body can adjust. Let’s say you’re going to Nepal heading west. If you travel from Atlanta to Los Angeles, onward through Asia, and eventually arrive in Nepal, you’ve shifted your external environment by many hours in a very short period of time. Likewise, if you fly from Charlotte to Washington, D.C. and onward to, say, Croatia, your internal clock is suddenly expected to operate on a European schedule. But your brain is still running on Eastern Time.
Hormones like melatonin (which helps you sleep) and cortisol (which helps you wake up) are released according to your old schedule. That’s why you may feel sleepy at lunchtime or alert in the middle of the night. It isn’t weakness or age. It’s physiology.
East or west?
Interestingly, the direction of travel matters. Most adults naturally operate on a circadian rhythm that runs slightly longer than 24 hours. In practical terms, that means it is generally easier for us to stay up later than to fall asleep earlier. When traveling west overall — such as heading to Nepal via a westward route — your day effectively lengthens. Many people find this adjustment somewhat smoother. You might feel tired in the late afternoon at first, but your body tends to adapt within a couple of days, especially once you are outside and active.
Eastbound travel, such as flying to Croatia, shortens your day. You are asking your body to go to bed before it feels ready. That is why eastbound trips often bring early-morning wakeups and difficulty falling asleep at local bedtime. It is not uncommon to wake at 3:00 a.m. feeling completely alert the first night or two.
Trekking helps!
The encouraging news for trekkers is that the very structure of a Hobnail trip helps your body recalibrate. Exposure to natural daylight is the single strongest signal your circadian system responds to. Add in steady physical movement, consistent mealtimes, and a reduction in late-night screen time, and you have a surprisingly effective reset environment. Many travelers are pleasantly surprised at how functional they feel by the second or third day on the trail.
What can I do?
There are also a few simple steps you can take to make the transition easier — none of which require turning your life upside down.
A few days before departure, begin shifting your bedtime in small increments. If you’re traveling west toward Nepal, try staying up 30 to 60 minutes later each night. If you’re heading east to Croatia, begin turning in a little earlier. The goal is not perfection; it is simply to narrow the gap your body must close upon arrival.
Once your flight departs, go ahead and change your watch and phone to your destination’s time zone. This sounds minor, but it is surprisingly powerful. When you see the “new” time on your wrist or screen, your brain begins adjusting mentally. From that point forward, start behaving according to destination time as much as possible — sleeping, eating, and even watching movies accordingly.
Hydration is another overlooked factor. Airplane cabins are extremely dry, and even mild dehydration can worsen fatigue and headaches. Drink water regularly during travel, moderate your alcohol intake, and use caffeine strategically rather than continuously.
When you arrive, be cautious with naps. A short 20–30 minute rest can take the edge off, but a long afternoon sleep almost guarantees a restless night. Get outside, seek appropriate light exposure (morning light for eastbound travel, later-day light for westbound travel), and eat meals on local time. Even your digestive system has its own clock, and aligning meals helps speed the adjustment process.
Finally, give yourself grace. A common guideline is that it takes about one day per time zone crossed to fully adjust. That doesn’t mean you’ll feel miserable for that long, but it does mean the first day or two may require patience.
The trip home might be worse
One thing we don’t talk about enough is return-trip jet lag. For many travelers, coming home can actually feel worse than going overseas.
If you’ve ever flown from Tokyo back to Nashville — which I did in January — you know what that can feel like. After days or weeks operating on a completely different time zone, your body has fully adapted. Then, almost overnight, you ask it to reverse course again. It’s not uncommon for return jet lag to linger — sometimes longer than you expect.
Even with careful planning, good hydration, and smart light exposure, you may simply have to soldier through a few days. You might wake at 4:00 a.m. for a week. You might feel foggy mid-afternoon. You might find that your sleep doesn’t fully normalize for longer than you’d like. That doesn’t mean you’ve done anything wrong.
When you return home, apply the same principles in reverse. Get morning light in your home time zone as soon as possible. Resist the urge to nap late in the day. Eat on local time. Keep caffeine earlier in the day. Maintain consistent bed and wake times, even if the sleep quality isn’t perfect at first.
But also be realistic. Your body is not a light switch; it’s a finely tuned biological system. Sometimes it simply takes time.
Keep the faith!
The important thing to remember is that jet lag is evidence of a beautifully designed internal clock doing exactly what it was meant to do. With preparation, intentional light exposure, hydration, and realistic expectations, your body will adapt — both going and coming home. And once you’re back in your own bed, even if you’re staring at the ceiling at 3:30 a.m., you can take comfort in knowing that your system is recalibrating.
It will settle. It always does.
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