You land and your body feels heavy, your head foggy — then at night you're wide awake. That's jet lag, and it isn't simple tiredness. It's your internal clock out of step with local time.
Which means "just push through" is slower than deliberately moving the clock.
The baseline — recovery takes roughly one day per hour of time difference. An eight-hour shift means about eight days naturally. The steps below can cut that by more than half.
Why eastward is harder
The human body clock naturally runs slightly longer than 24 hours, so going to bed later is easy and going earlier is hard.
| Direction | What your body must do · difficulty |
| Westward (e.g. Asia → Europe or US west) | Day gets longer → sleep later → easier |
| Eastward (e.g. Europe → Asia) | Day gets shorter → sleep earlier → harder |
| North–south (no time change) | Little jet lag, just travel fatigue |
So prepare in advance for eastward trips; westward can often be handled on arrival.
Light is your strongest tool
| Goal | Seek light / avoid light |
| Eastward (need earlier sleep) | Bright light in the local morning / avoid it in the evening |
| Westward (need later sleep) | Light in the local afternoon and evening / avoid strong early-morning light |
Natural outdoor light is far stronger than indoor lighting. A 30-minute walk on arrival day speeds adaptation noticeably. When you need to avoid light, use sunglasses and blackout curtains.
Timeline — what to do when
| When | What to do |
| 3–4 days before | Eastward: shift sleep 30–60 min earlier daily. Westward: later |
| Night before | Don't stay up — sleep debt worsens jet lag |
| Boarding | Set your watch to destination time and think in it |
| In flight | Sleep if it's night there, stay awake if it's day. Hydrate; skip alcohol |
| Arrival day | Stay up until local bedtime; get outdoors |
| Days 2–3 | Keep wake-up time consistent — it matters more than bedtime |
Napping rules
- 20–30 minutes max — deeper sleep leaves you groggier
- Before 3pm — later naps wreck the night
- Always set an alarm
In-flight habits
| Water | Every 1–2 hours — cabins are very dry and dehydration amplifies fatigue |
| Alcohol | Avoid — it helps you fall asleep but degrades sleep quality |
| Caffeine | None after late afternoon destination time |
| Meals | Eating on destination schedule aids adjustment |
| Movement | Walk every 2–3 hours (circulation) |
| Sleep kit | Eye mask, earplugs — blocking light is key |
Helping recovery after arrival
- Fix your wake-up time — anchoring the morning shifts the clock faster than chasing bedtime.
- Eat breakfast — meal timing is another clock signal.
- Light exercise — a walk is enough; avoid intense workouts near bedtime.
- Melatonin — evidence supports timed use, but dose and timing matter and responses vary. Ask a professional first.
- Be careful with sleeping pills — they induce sleep without moving the body clock.
Short trips — consider not adjusting
For trips of two to three days, staying on home time can beat adapting. You'd barely adjust before returning — and you avoid a second round of jet lag at home. Just manage your energy around key meetings.
FAQ
How long does jet lag last?
Roughly a day per hour of difference, longer going east. Good light timing shortens it considerably.
Can I sleep right after landing?
If it's night locally, yes. The problem is sleeping during local daytime — that stalls the shift.
Must I sleep on the plane?
Only when it's night at your destination. Sleeping regardless can slow adaptation.
Why is the return trip worse?
The return is often eastward, and travel fatigue has accumulated. Leave a spare day after getting home.
Beating jet lag isn't about endurance — it's about when you see light. A 30-minute walk on day one can save days.
This is general health information and does not replace medical advice. Consult a professional about melatonin or sleep medication, and see a doctor before travel if you have a health condition.
