Jet lag: the light schedule that shortens it, and where breathing fits

    You are lying awake at three in a hotel room doing time-zone arithmetic, then falling asleep in a meeting at two in the afternoon. Everyone says to get on local time, which you would love to do if your body agreed.

    Do this now

    First two nights, ten minutes

    10 minutes

    1. Room dark and cool, phone away. Do not calculate what time it is at home.
    2. Lie on your side, mouth closed, nose only.
    3. In for four, hold briefly or not at all, out for eight. Silent and small.
    4. Count exhales to ten and start again for ten minutes.
    5. If you are wide awake after twenty minutes, get up in very low light, do something dull, and go back when sleepy. Then get outside as early as you can in the morning.
    Run it with a timer

    It is a phase problem, not a tiredness problem

    Your internal clock is still set to where you left, and it shifts by only about one time zone a day on its own. Everything that helps works by moving the clock faster, and almost nothing works by trying harder to sleep. That is why jet lag advice that focuses on the bed rather than on light mostly fails.

    Which way to chase the light

    The direction matters. Flying east, you need to advance your clock: seek light in the local morning and avoid it in the local evening. Flying west, you need to delay: get light in the local late afternoon and evening and avoid early-morning light. Getting this backwards is the most common self-inflicted cause of a long recovery, and it is why sunglasses at the right hour are as useful as sunshine at the right hour.

    What breathing contributes

    Nothing to the clock. What it does is reduce the arousal that travel adds — the cortisol of a long day, an unfamiliar room, the dread of the meeting — so the sleep window you do have is used rather than spent lying awake. Combined with correct light timing, that is the realistic version: a shorter adjustment, not an abolished one.

    What changes it, over a week

    • Before you fly

      Shift your bedtime an hour toward the destination for two or three nights if the trip is long. Partial pre-adaptation is worth more than it sounds.

    • On arrival

      Get outdoor light at the right end of the local day for your direction of travel, and eat on local mealtimes.

    • Both first nights

      Ten minutes of long-exhale nasal breathing in bed, then the twenty-minute get-up rule if needed.

    • Naps

      Twenty minutes maximum, before mid-afternoon local time. Longer naps spend the sleep pressure the night needs.

    When this is not a breathing pattern

    See a clinician — promptly, and before assuming any of this applies to you — if any of these describe you:

    • Calf pain or swelling, or breathlessness, after a long flight — possible clot, seek care urgently
    • Chest pain or palpitations
    • Existing sleep disorder, epilepsy, diabetes or bipolar disorder — travel across time zones needs planning with your clinician, particularly around medication timing
    • Sleepiness severe enough to affect driving on arrival
    • Pregnancy with any complications, where long-haul travel warrants advice first

    This page is education, not medical advice, and no part of it is a diagnosis. Full disclaimer.

    Questions people ask

    How long does jet lag last?
    Roughly a day per time zone crossed without help, often faster eastbound than people expect and slower westbound than they hope. Correct light timing can cut it substantially.
    Which direction is worse?
    Eastbound is generally harder, because the body clock finds it easier to delay than to advance — your natural rhythm runs slightly longer than 24 hours.
    Should I take melatonin?
    It has Cochrane-level support for jet lag, and its effect depends entirely on when you take it. That makes it a pharmacist or doctor conversation, not a guess in an airport.

    What this page is built on

    • — Eastman & Burgess, 2009, Sleep Medicine Clinics — how to travel the world without jet lag: light timing protocols
    • — Herxheimer & Petrie, 2002, Cochrane Database — melatonin for preventing and reducing jet lag
    • — Zaccaro et al., 2018, Frontiers in Human Neuroscience — slow breathing and pre-sleep arousal

    Named by author and year. The DOIs live in the journal.

    Put a number on it

    Most of what is on this page tracks one measurement: the Control Pause. It takes sixty seconds, needs no account, and it is the thing that tells you whether any of this is working.

    Take the free test

    Go deeper

    From the journal

    Sleep and the night

    Falling asleep, waking at three, and the hours you spend tired but wired. All topics