How to Beat Jet Lag with a Simple Plan

Jet lag happens because your internal body clock is still on home time while the sun says otherwise. The simple fix is to move your clock toward the new time using daylight, meal timing and sleep timing, starting a few days before you fly if you can.

This guide is general information, not medical advice. If you have a health condition, take medication on a schedule, or are pregnant, ask your doctor before changing your routine or trying supplements.

What jet lag actually is

Your body runs on a roughly 24-hour clock that controls sleep, alertness, hunger, body temperature and mood. Light is the strongest signal that sets it. When you cross time zones faster than your clock can adjust, you feel off.

Common signs:

• Sleepiness in the middle of the day
• Wide-awake at 3 a.m.
• Poor focus and a slow, foggy feeling
• Stomach upset or odd hunger
• Low mood or irritability

A rough rule of thumb is that your body clock shifts about one hour a day, sometimes a bit more. Crossing six time zones may take five or six days to feel normal. Traveling east tends to feel harder than traveling west, because going east asks you to fall asleep earlier than your body wants.

Step 1: Decide whether to adjust at all

If your trip is only a day or two, it may be easier to stay on home time. Schedule meetings and meals around your home clock and sleep when you normally would.

For a trip of three days or more, shifting to local time usually pays off. The rest of this guide is for that.

Step 2: Do a gentle shift before you leave (2 to 4 days out)

You do not need to change much. A small head start helps.

Traveling east (for example, New York to Paris):

• Go to bed 30 to 60 minutes earlier each night for the 2 to 3 nights before departure.
• Wake earlier and get bright light right after waking.
• Move dinner a little earlier.

Traveling west (for example, New York to Los Angeles or Honolulu):

• Go to bed 30 to 60 minutes later each night.
• Get light in the evening instead of the early morning.
• Move dinner a little later.

If your schedule is packed, skip this step. It helps, but it is optional.

Step 3: Use light like a tool

Light is the most powerful clock-setter you have. The basic idea:

• Light in the morning moves your clock earlier. Helpful when traveling east.
• Light in the evening moves your clock later. Helpful when traveling west.
• Light at the wrong time can push you the wrong way. If you are crossing many time zones, avoid bright light in the hours that would delay or advance you in the wrong direction.

A practical shortcut for many trips of up to about eight hours of difference:

Direction	Seek bright light	Avoid bright light (sunglasses help)
East	Morning at your destination	Late afternoon and evening at your destination for the first day or two
West	Late afternoon and evening at your destination	Early morning at your destination for the first day or two

For big shifts of eight or more hours, your body might confuse “morning” and “evening” at first. In that case, start with light exposure later in the day on arrival and shift it gradually. There are online jet lag calculators that map this out based on your flight times.

Outdoor light, even on a cloudy day, is far stronger than indoor light, so take your walk outside.

Step 4: Set your watch and eat on local time

The moment you board, set your watch and phone to your destination time. Start acting as if it is there.

• Eat meals at local mealtimes, even if you are not hungry. A light meal is fine.
• If it is night at your destination, try to sleep on the plane. If it is daytime there, stay awake if you can.
• Avoid heavy meals right before sleep.

Your body also tracks meals. Eating on a regular local schedule helps the clock catch up.

Step 5: Handle the flight itself

• Drink water. Cabin air is dry. Carry a refillable bottle and fill it after security.
• Limit alcohol. It can fragment sleep and add to dehydration.
• Watch caffeine. Use it early in the destination day if you need it, not within 8 hours of when you plan to sleep.
• Move. Walk the aisle every hour or two when the seat belt sign is off, and stretch your ankles and calves.
• Make a sleep kit. An eye mask, ear plugs or noise-canceling headphones, a neck pillow and a light layer to stay warm.
• Skip the screen near sleep time. Bright screens can tell your brain it is daytime.

Step 6: Land and follow the first-day plan

The first day sets the tone for the rest of the trip.

1. Get outside. Walk for 20 to 30 minutes in daylight, at the time that fits your direction (see the table).
2. Stay awake until a reasonable local bedtime. This is the hard part. Keep busy and avoid sitting down in a warm room.
3. Nap only if you must. Keep it to 20 to 30 minutes, set an alarm, and nap before mid-afternoon local time. Our guide on napping without wrecking your night covers this in detail.
4. Eat local meals. A light dinner a couple of hours before bed.
5. Wind down. Dim the lights, put the phone away and keep the room cool and dark. The routine from how to wind down for better sleep works anywhere.

Step 7: Be ready for the 3 a.m. wake-up

On the first few nights you may wake at what feels like the middle of the night. Do not look at your phone. Use the same approach in our guide on stopping 3 a.m. wake-ups: breathe slowly, relax your body, and if you are wide awake after a while, sit up with a dim light and something dull to read.

Avoid grabbing a big meal or coffee at 4 a.m. just because you are up. That can lock in the wrong schedule.

A day-by-day sample: New York to London (5 hours ahead)

Day	What to do
3 days before	Bed 45 minutes earlier. Get bright light right after waking.
2 days before	Bed another 45 minutes earlier. Early dinner.
Flight day	Set your watch to London time at boarding. Sleep for a few hours on the overnight flight if you can. Water, not wine.
Day 1	Arrive in the morning. Walk outside in daylight. Light lunch. Short nap only if essential, 20 minutes before 2 p.m. Bed about 10 p.m. local.
Day 2	Get up at a regular local time. Morning light. Keep caffeine before noon.
Day 3	You should feel more like yourself. Keep meals and bedtime regular.

Melatonin and other aids

Some travelers take a small dose of melatonin at the new bedtime. It can help some people, but timing and dose matter, and it is not right for everyone. Ask your doctor or pharmacist before using it, especially if you take other medications, are pregnant or have a health condition.

Sleeping pills on planes carry risks, such as grogginess and reduced movement. Talk with your doctor before using any.

Traveling with kids

Kids often adjust faster than adults but can be cranky. Keep them on their usual routine as much as the new time zone allows: familiar bedtime story, favorite blanket, the same snack. Get them outdoors in daylight. Let a toddler nap on arrival, but cap it at an hour so the night is not lost.

Quick checklist

• Decide whether the trip is long enough to adjust (3 days or more)
• Shift sleep by 30 to 60 minutes a night for 2 to 3 days (optional)
• Set your watch to destination time on boarding
• Drink water, limit alcohol and caffeine
• Pack an eye mask, ear plugs and a layer
• Get outside in daylight on arrival
• Eat at local mealtimes
• Nap only 20 to 30 minutes, early
• Wind down the same way each night
• Be patient. Plan on a day of recovery for every one or two time zones

When to get help

Jet lag should fade within about a week. Check in with a doctor if you feel unwell for much longer, if you have chest pain, breathing trouble or leg swelling or pain after a long flight (these can be signs of a blood clot and need urgent care), or if you frequently travel across many time zones and struggle with sleep or mood. If you work irregular hours, a doctor can help you plan.

A calm next step

If you want the plan on one page, with day-by-day charts for both directions, the Jet Lag and Travel Sleep Plan gives you a fill-in template to match your flight times. It is a printable helper and not medical advice. The checklist above is enough to get started on your next trip.

Pick your next flight, mark the three days before it on your calendar, and decide where your first daylight walk will be. A small plan beats a rough week.