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How to Beat Jet Lag: A Time-Zone Plan That Actually Works

Jet lag isn't about being tired. It's your body clock running on the time zone you left while the sun, your meals, and your alarm run on the one you landed in. Sleeping more doesn't fix that. Timing does. Here's a plan you can actually follow, broken into before the flight, on the plane, and after you land.

Why East Feels Worse Than West

Your internal clock naturally runs a little longer than 24 hours, so it finds it easier to stay up later than to go to sleep earlier. Flying west (say, New York to Los Angeles) asks you to stay up later: most people handle that fine. Flying east (Los Angeles to London) asks you to fall asleep and wake up hours before your body wants to, which is why the same number of time zones feels so much rougher on the way east. The CDC Yellow Book puts typical adjustment at about 1 hour per day flying east and about 1.5 hours per day flying west. Crossing six zones eastbound without a plan can mean most of a week feeling off.

Step 1: Know the Real Time Difference Before You Book Anything

This sounds obvious, but it's where most jet lag plans go wrong. Daylight saving time doesn't change on the same date everywhere, and some places don't observe it at all. So the gap between home and your destination can be an hour different in March than it is in July. Check the actual local time at the destination airport for your travel dates, not the difference you remember from last time. Then check the layover airport too, since a connection through a third time zone changes when you'll realistically be able to sleep.

Step 2: Start Shifting 2 to 3 Days Before You Fly

You don't need to fully adjust before you leave. Getting partway there makes the first days at the destination far easier.

• Flying east: go to bed and get up about an hour earlier each day for two or three days before departure. Get bright light soon after you wake up.
• Flying west: go to bed and get up about an hour later each day. Get bright light in the evening, and keep your mornings dim.

Two or three hours of head start on a six-hour trip cuts the adjustment you have left to do at the destination by a third to a half.

Step 3: On the Plane, Switch to Destination Time

As soon as you board, set your mental clock (and ideally your watch) to destination time and act accordingly. If it's nighttime where you're going, try to sleep: eye mask, earplugs or noise-canceling headphones, and a window seat so no one wakes you to get past. If it's daytime there, stay awake, even if the cabin is dark.

A few things quietly make jet lag worse in the air:

• Alcohol: it may knock you out, but it fragments the sleep you get and adds to the dehydration of a dry cabin.
• Caffeine at the wrong time: fine when it's morning at your destination, a problem if it's evening there.
• Eating on autopilot: meal times are a strong time cue. Eat when it's a normal meal time at the destination, even if the cart comes around at a different hour.

Step 4: After You Land, Use Daylight on Purpose

Light is the strongest signal your body clock responds to, and it cuts both ways: the right light at the right time speeds up adjustment, and the wrong light slows it down.

• After flying east: get outside in the morning and early afternoon, and dim things down in the evening. If you crossed eight or more time zones, go easy on very early morning light for the first day or two and favor late morning instead. At that distance, early light can push your clock the wrong way.
• After flying west: get outside in the afternoon and early evening, and try not to fall asleep before a reasonable local bedtime.

Knowing when the sun actually rises and sets at your destination makes this much easier to plan than guessing. In winter at high latitudes, "morning light" might not start until well after 8:00 a.m.

Step 5: Nap Smart, and Don't Sleep Through the First Afternoon

The single most common mistake is landing in the morning after an overnight eastbound flight, "just lying down for an hour," and waking up at 6:00 p.m. That long nap resets you straight back toward home time. If you need to nap, keep it to about 20 to 30 minutes, set an alarm, and do it before mid-afternoon. Then stay up until a normal local bedtime, even if it's a slog.

When to Skip All of This: Short Trips

If you're only somewhere for two or three days, fully adjusting may not be worth it. You'd finally feel normal on the day you fly home. For short trips, many travelers do better staying close to home time and scheduling the important things (meetings, a big dinner, a drive) for hours that line up with when they'd normally be awake at home.

What About Melatonin?

Melatonin is widely used for jet lag, and timing matters more than dose. Taken at the wrong time, it can shift your clock the wrong direction. It's worth asking your doctor or pharmacist before using it, especially if you take other medications.

The Short Version

• Confirm the real time difference for your travel dates, including daylight saving time.
• Shift your sleep about an hour a day for 2 to 3 days before you fly.
• Switch to destination time the moment you board.
• Skip the in-flight alcohol, and time caffeine and meals to the destination.
• Chase daylight at the right time of day after you land.
• Short naps only, and stay up until local bedtime on day one.

This post is general travel information, not medical advice. If you have a sleep disorder or health condition, or take medication, talk to a doctor before changing your sleep routine or using sleep aids. AvClock is reference and informational only, not for flight planning or navigation.