How do I sleep well on a plane?

(1) Window seat for head support, (2) eye mask + earplugs (or noise-canceling headphones), (3) neck pillow, (4) loose clothing, (5) no alcohol or caffeine, (6) low-dose melatonin (0.3 mg). Without business class, perfect sleep is unlikely, but you can secure short rest periods.

How do I handle jet lag on a short business trip (2–3 days)?

Don't adapt. Keep Korean time pattern. Even if meetings fall at Korean dawn, use caffeine and sunlight to stay awake just then, sleep on Korean time the rest. No adaptation = no return-trip jet lag. For 2–3 days, recovery would take longer than the trip itself, so trying to adapt is inefficient.

Going abroad with kids — what about their jet lag?

Kids are more jet-lag-resilient but also recover faster. (1) Tell them the destination time in advance, (2) first 24 hours of sunlight and activity, no naps, (3) bedtime an hour earlier than usual (fatigue absorption), (4) melatonin for children requires doctor prescription. They adapt 2–3 days faster than adults but recovery is harder once disrupted, so consistency matters.

Is melatonin really necessary for jet lag?

For time-zone differences of 4+ hours, recommended. Below that, natural adaptation suffices. Studies consistently show melatonin shortens jet lag by 1–2 days. But sunlight exposure and meal timing alone reach about 70% of the effect — if you can't bring melatonin, other tools substitute.

The return-trip jet lag feels worse — why?

It can be — yes. (1) You have to undo the outbound adaptation — double adaptation, (2) vacation sleep hygiene crumbles (drinking, late meals), (3) immediate return-to-work pressure. Solution: keep first 1–2 days post-return light, get sunlight immediately on arriving in Korea, melatonin first night.

Beating jet lag — eastbound is different, start before departure

Eastbound is 50% harder to adjust to than westbound. Rule: one day per time zone. Pre-adjustment 3 days before + local sunlight + strategic melatonin + an "anchor" sleep on night one.

For frequent international travelers, the biggest enemy isn't flight duration but jet lag. Eight time zones disrupt the next week more than the eight-hour flight itself. With a little scientific preparation, 90% of jet lag is controllable.

A scene with multiple clocks — Bodies live by 24-hour rhythms; airplanes ignore them.

Why jet lag happens

The body's master clock — the suprachiasmatic nucleus (SCN) — controls hormones and body temperature on a roughly 24-hour cycle. This clock changes slowly — usually by about an hour per day — so when a plane skips 8 hours instantly, full adaptation takes about 8 days. In between, you're jet lagged.

Symptoms:

Sleeplessness at local night / drowsiness at local day
Disrupted appetite (hunger at night)
Constipation / diarrhea
Headaches, poor concentration
Mood instability

Eastbound vs westbound — 50% difference

The natural human circadian rhythm is about 24 hours 15 minutes — slightly longer than 24. The body naturally tends to "delay" time. This makes flight direction matter.

Westbound (Korea → Europe): time delayed. Aligns with the body's natural tendency → easier.

Eastbound (Korea → US): time advanced. Opposes the body's natural tendency → 50% harder.

"One day per time zone" applies precisely to eastbound. Westbound is roughly 0.7 days.

Three days before departure — pre-adjustment

Starting before the flight handles half the eventual jet lag.

Eastbound (Korea → LA, NY)

Day	Korean time
D-3	Sleep 1 hour earlier (usual 23 → 22)
D-2	Sleep 2 hours earlier (21)
D-1	Sleep 3 hours earlier (20)

Realistically hard, but as much as you can shift makes arrival jet lag measurably milder.

Westbound (Korea → Europe)

Opposite — sleep 1 hour later each day. More natural, easier to do.

In flight — switch to local time early

Set your watch (or phone) to destination time the moment you board. If it's nighttime there, try to sleep (mask, earplugs); if daytime, stay awake (read, watch films).

If meal service doesn't fit destination time, refuse or eat little. Skip alcohol and caffeine — both worsen jet lag. Plenty of water.

Morning sunlight — The first sunlight after arrival — the most powerful jet-lag tool.

After arrival — the first 24 hours decide everything

Eastbound arrival

Switch everything to local time immediately: phone, meals, activities
Daytime arrival: absolutely no naps. Even if drowsy, take a 30-minute walk. Caffeine is okay (until local 2 PM).
Nighttime arrival: sleep right away. Take 0.5–1 mg melatonin 30 minutes before bed.
Next morning: 30 minutes of outdoor sunlight on waking — the strongest SCN reset signal.
Next 3–5 days: morning sunlight + 9 PM melatonin daily. Near-complete adaptation in 5 days.

Westbound arrival

Usually arrives in evening → can sleep early that night (though jet lag may delay it)
Morning sunlight next day + late-afternoon caffeine OK
If sleepless at night, don't stay in bed — get up, read in dim light
3 days for adaptation

Melatonin — the jet-lag-specific weapon

Melatonin's clearest use is jet lag. Uncertain for general insomnia, but proven for jet lag.

Eastbound:

Daily for 3–5 days after arrival
0.5–1 mg at local 9–10 PM
Reinforce with morning sunlight

Westbound:

Usually unnecessary (natural adaptation)
Exception: 8+ time zones — try first 1–2 days

In Korea, melatonin requires a prescription. Bring US OTC (NOW Foods, Natrol) at 0.5–1 mg dose via direct purchase.

Jet-lag-resistant vs jet-lag-prone

Same flight, different recovery speeds.

Resistant: flexible circadian rhythm baseline. Small weekend-weekday gap. Same daily wake time.
Prone: night-owl baseline. Over 50. Chronic sleep deprivation.

If you're jet-lag-prone, fly less or budget more recovery time.

Soft evening lighting — The right melatonin pill makes a week of difference.

Business vs leisure jet-lag strategies

Business trips (≤5 days short stay): don't even try to adapt — keep Korean time pattern. Just stay alert during meeting times even if it's 4 AM Korean time, and sleep on Korean time otherwise. No adaptation means no return-trip jet lag.

Vacation / long stays (1+ weeks): full adaptation as above. The few days invested in adaptation transform the rest of the trip.

Conclusion — jet lag is conquerable

Don't accept jet lag as fate; treat it as a manageable challenge. 3 days of pre-adjustment before departure, switching time on the plane, first sunlight after arrival, melatonin for the first 5 days. These four steps eliminate 90% of jet lag.