How to Deal With Jet Lag

The Short Answer

Get sunlight at the right times, take melatonin strategically, shift your schedule before you leave, and stay on destination time the moment you land. Jet lag is your body clock fighting a new time zone, and you beat it by giving your clock the right signals at the right moments.

What Jet Lag Actually Is

Jet lag isn't just tiredness from a long flight. It's a real physiological condition caused by your circadian rhythm being out of sync with local time. Your body has an internal clock that regulates when you feel sleepy, alert, hungry, and even when your organs function best. When you cross time zones rapidly, that clock is still set to "home" while everything around you says otherwise.

Symptoms go beyond sleepiness. You might deal with brain fog, digestive issues, irritability, difficulty concentrating, and a general feeling that something is just off. It takes roughly one day per time zone crossed for your body to fully adjust. So a trip from New York to London (5 time zones) could mean 5 days of feeling subpar without intervention.

Direction Matters

Flying east is harder than flying west. About 75% of people struggle more with eastbound travel. The reason is biological. Your body's natural clock cycle is slightly longer than 24 hours, so it's easier to stay up later (which westbound travel requires) than to fall asleep earlier (which eastbound demands).

This means a trip from LA to Tokyo will hit you harder than Tokyo to LA, even though the flight time is similar. Plan more aggressively for eastbound recovery.

Before You Leave: Pre-Shift Your Schedule

The single most effective thing you can do starts 3 days before departure.

For eastbound travel: Move your bedtime 1 hour earlier each day. Go to bed at 10pm instead of 11pm on day one, 9pm on day two, 8pm on day three. Shift your meals earlier too.

For westbound travel: Move your bedtime 1 hour later each day. Stay up until midnight, then 1am, then 2am.

This isn't always practical with work and life, but even a partial shift helps. Moving your schedule by just 1-2 hours before departure takes the edge off.

Light Exposure: Your Most Powerful Tool

Light is the primary signal that sets your circadian rhythm. Strategic light exposure is more effective than any pill, supplement, or trick.

Eastbound Travel (Advance Your Clock)

• Get bright light in the morning at your destination. Go outside. Sunlight is 100x more powerful than indoor lighting for resetting your clock.
• Avoid light in the evening. Wear sunglasses if you're out late. Dim your phone and laptop screens. Your brain interprets evening light as a signal to stay awake.

Westbound Travel (Delay Your Clock)

• Avoid light in the morning. Sleep in if you can. Keep curtains closed.
• Get bright light in the late afternoon and evening. Go for a walk. Sit outside. The evening light tells your brain it's still daytime.

A common mistake is getting light at the wrong time. If you've traveled east across 8+ time zones, morning light at your destination might actually correspond to your body's "nighttime," which would push your clock the wrong direction. For extreme time zone changes (8+), consider consulting a jet lag calculator app like Timeshifter to nail the timing.

Melatonin: Timing Is Everything

Melatonin is a hormone your body naturally produces when it's time to sleep. Taking it as a supplement can help signal your body that bedtime has arrived, even when your internal clock disagrees.

Here's how to use it effectively:

• Dose: 0.5-3mg is the sweet spot. Higher doses (5mg+) don't work better and can cause grogginess. Start low.
• Timing: Take it 30 minutes before your target bedtime at your destination. That means if you want to sleep at 10pm local time, take it at 9:30pm local time.
• Duration: Use it for up to 5 days after arrival. You shouldn't need it longer than that.
• Critical warning: Taking melatonin at the wrong time can make jet lag worse. If you take it in the morning or early afternoon, it will push your clock in the wrong direction. Only take it at or near bedtime.

Melatonin is available over the counter in the US but requires a prescription in some countries. Check the rules at your destination and bring what you need from home.

On the Plane

Start your adjustment during the flight, not after you land.

Set your watch immediately. As soon as you board, set your watch (and your mindset) to destination time. Start thinking in terms of "is it daytime or nighttime where I'm going?"

Sleep when it's nighttime at your destination. If you're landing in the morning, sleep on the plane. Use an eye mask, earplugs, and melatonin to help. If you're landing at night, try to stay awake during the flight so you're tired enough to sleep on local time.

Stay hydrated. Dehydration makes jet lag symptoms worse. Drink water throughout the flight and limit alcohol and caffeine.

When You Land

The first 24 hours at your destination are make-or-break for jet lag recovery.

If You Arrive in the Morning

• Get outside into sunlight immediately
• Go for a walk. Exercise accelerates circadian adjustment
• Eat a meal on the local schedule
• Do not nap. This is the hardest part but also the most important. If you absolutely must nap, set an alarm for 20 minutes maximum
• Push through until at least 9pm local time before going to bed

If You Arrive in the Evening

• Have a light meal
• Take melatonin 30 minutes before your target bedtime
• Go to sleep at a reasonable local hour
• Don't sleep in too late the next morning. Set an alarm and get into sunlight

The Fasting Trick

Some research suggests that fasting for 12-16 hours before your first meal at the destination can help reset your body clock. The idea is that your body has a "food clock" separate from your light clock, and you can use hunger to help override the circadian confusion.

In practice, this means stopping eating about 16 hours before breakfast time at your destination. If breakfast will be at 8am in London, stop eating at 4pm the day before (your time). Then eat a good breakfast when you land.

The science on this is mixed, but plenty of frequent travelers swear by it. At minimum, eating on the local meal schedule when you arrive definitely helps.

Exercise and Fresh Air

Rick Steves has a great line: "Jet lag hates fresh air, daylight, and exercise." He's right. A brisk walk outside on your first day does triple duty. You get light exposure, physical activity that promotes better sleep that night, and mental stimulation that keeps you awake when your body wants to crash.

Don't plan a gym session. Just walk. Explore your destination on foot. The combination of movement, sunlight, and mental engagement is the best natural jet lag cure available.

What Doesn't Work

Sleeping pills on the plane: They knock you out but don't reset your clock. You'll feel groggy and still be jet-lagged.

"Just toughing it out": Ignoring jet lag doesn't make it go away faster. Your body clock adjusts at about one time zone per day regardless.

Staying on home time: Unless your trip is 48 hours or less, trying to stick to your home schedule is impractical and isolating. Commit to the local time zone.

Excessive caffeine: It'll keep you awake when you should be adjusting, then crash you at the wrong time. Use it sparingly and only in the morning at your destination.