Jet Lag After Flying to Japan: What the Science Says About Your First 3 Days in Tokyo

Jet lag after flying to Japan is your body clock running on home time while Tokyo runs on another — and from North America the gap is huge, 13 to 17 hours. According to the CDC, the body usually re-adjusts by only about 1 to 1.5 hours a day, so a few groggy days are normal. This guide explains what the research says about light, sleep, caffeine and melatonin, and suggests a gentle three-day plan for your first days in Tokyo, based on the quieter east side of the city where we work.

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Updated October 2026 — reviewed by Sunny Pham Sensei (Lệ Nhật Sensei), Japan National Acupuncture License No. 196186 (鍼師) / 195591 (灸師). Written by the Fuji Wellness team, based locally in Edogawa City, east Tokyo.

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How big is the time difference to Tokyo?

Japan uses one time zone (JST, UTC+9) and does not change its clocks. Most of the countries our visitors come from do, so the gap shifts by an hour in autumn. Times below are approximate.

Flying from	Tokyo is ahead by (until clocks change)	After clocks change	Typical nonstop flight
Vancouver, Seattle, Los Angeles	16 hours	17 hours (from November 1, 2026)	about 10–12 hours
Toronto, New York	13 hours	14 hours (from November 1, 2026)	about 13–14 hours
London	8 hours	9 hours (from October 25, 2026)	about 14–15 hours
Paris, Berlin, Amsterdam	7 hours	8 hours (from October 25, 2026)	about 13–14 hours
Sydney, Melbourne	Sydney is 1 hour ahead of Tokyo	Sydney is 2 hours ahead (from October 4, 2026)	about 9–10 hours

If you are flying from Australia, jet lag is usually mild because the clock barely moves; the long, often overnight flight and lost sleep are the bigger issue. For travellers from the US, Canada and Europe, expect a real adjustment period.

What the science says about jet lag

The CDC Yellow Book chapter on jet lag is the most useful plain summary for travellers. Key points:

Symptoms usually start within 1–2 days of travel: poor night sleep, daytime sleepiness, foggy thinking, low energy and sometimes an upset stomach.
Speed of adjustment: about 1 hour per day after flying east and about 1.5 hours per day after flying west. The body clock naturally runs slightly long, so delaying it is easier than advancing it.
Light is the main signal. Light at certain times of your body’s day shifts the clock earlier; light at other times shifts it later. The CDC recommends maximising natural daylight at your destination.
Before you go: the CDC suggests shifting your sleep about 1 hour per day for 2–3 days before departure, towards your destination’s time.

Because the best hours for light depend on your home time zone, the CDC suggests a plan personalised to your route, for example from a jet lag calculator or a travel medicine clinic. As a rough guide, travellers from Europe often do better with late-morning and midday light in the first days rather than bright dawn light, while North Americans usually benefit from plenty of daytime light in Tokyo. Treat this as general information, not a prescription.

Caffeine, naps, alcohol and melatonin

Tool	What the CDC and NCCIH say	Practical tip in Tokyo
Caffeine	Can help daytime alertness; stop about 6 hours before bedtime (caffeine’s half-life is around 5 hours)	Convenience stores and vending machines sell coffee everywhere — easy to overdo, so set a cut-off time
Naps	Short naps of 20–30 minutes can help; long daytime naps make night sleep worse	Set an alarm before lying down in your hotel
Alcohol	Helps you fall asleep but fragments sleep and adds dehydration	Keep the first nights’ izakaya visit light
Melatonin	Reviews suggest it may help with jet lag; low doses are often enough, and timing matters more than dose	Talk to your doctor or pharmacist first (see below)

A few important notes on melatonin. The NCCIH melatonin page says short-term use appears safe for most people, but product labels are not always accurate, and people taking medicines — especially blood thinners — or living with epilepsy should talk to a health professional first. In Japan, melatonin is treated as a medicine rather than a supplement and is not sold in drugstores, so if you plan to use it, bring it with you and check Japan’s personal-import rules for medicines before you pack. For prescription sleep aids, ask your own doctor before the trip.

A gentle three-day plan for east Tokyo

Many jet-lagged visitors wake at 3:00 or 4:00 on their first mornings. Rather than fight it, use the quiet hours. East Tokyo — Ryogoku, Kinshicho, Kameido and the Sumida River — is good for this because it is flat, residential and calm early in the day.

Day 1: arrival day

Aim to stay awake until a reasonable local bedtime (around 21:00–22:00), with a 20–30 minute nap at most.
Get outside in daylight once you have dropped your bags, even for 30 minutes. Avoid heavy luggage on station stairs by sending suitcases ahead with a hands-free luggage service if you can.
Eat a light, early dinner at local mealtimes, drink water and keep alcohol modest.
Dim the lights and screens in the evening.

Day 2: the early-riser morning

If you wake before dawn, have a shower and a simple breakfast from a convenience store, then walk as it gets light.
The Sumida River Terrace is a riverside walkway with benches that runs past Ryogoku and towards Asakusa — a flat, low-effort walk.
Kameido Tenjin Shrine is free and peaceful early in the day, with its drum bridges and a view of Tokyo Skytree across the pond.
Keep sightseeing to a half day. Plan a short nap (if needed) before 15:00 and stop caffeine by mid-afternoon.

Day 3: a fuller day, still paced

Most people feel noticeably better by now, but not fully adjusted. This is a good day for a classic loop such as our east Tokyo one-day itinerary — with breaks.
Walking 20,000 steps on jet-lagged legs is hard. Our guide to sore feet in Tokyo has pacing ideas.
Save very late nights, long hikes and big day trips for the end of your first week.

Does acupuncture help with jet lag?

We want to be clear: there is no good evidence that acupuncture shortens jet lag, and we do not offer it as a jet lag treatment. The NCCIH overview of acupuncture notes some evidence for certain pain conditions, such as back and neck pain, and also that part of the benefit seen in studies may come from non-specific effects such as expectation and the care setting.

What we do see is that some travellers, especially after a 10–14 hour flight, book a session in their first days simply as a calm hour lying down, or to have a stiff neck and shoulders looked at. If that sounds useful, see our post on neck and shoulder stiffness after a long flight.

Visiting Fuji Wellness in your first days

Fuji Wellness is an appointment-only acupuncture clinic in Matsushima, Edogawa City, with consultations in English, Vietnamese and Japanese. On Saturdays, Sundays and public holidays the clinic opens at 8:00 (until 12:00), which suits jet-lagged early risers who are already up and walking. Monday to Thursday hours are 9:00–12:00 and 14:00–17:00; the clinic is closed on Fridays.

The nearest stop is Komatsugawa-keisatsusho-mae, a 3-minute walk away, on Toei bus routes 錦25 and 錦27 from Kinshicho (about 15 minutes) and 錦25, 錦27 and 亀26 from Kameido (about 10 minutes). See how to get to Fuji Wellness for step-by-step directions, and book via our contact page or WhatsApp.

When is it more than jet lag?

Jet lag is unpleasant but not dangerous. Seek medical care rather than waiting it out if you have:

Chest pain, sudden shortness of breath, or pain and swelling in one leg after the flight — call 119 for an ambulance if severe. The CDC notes travel-related blood clots usually appear within 1–2 weeks of a long flight.
Fever, severe headache, confusion, or vomiting that does not settle.
Sleep problems that are still severe after a week or more.

For help finding an English-speaking doctor, call the Tokyo Metropolitan Health and Medical Information Center “Himawari” on 03-5285-8181 (English, every day 9:00–20:00) or JNTO’s Japan Visitor Hotline on 050-3816-2787 (24 hours).

Frequently asked questions

How long does jet lag last after flying to Japan?

According to the CDC, the body clock adjusts by roughly 1 hour per day after eastward travel and 1.5 hours per day after westward travel. With a 13–17 hour gap from North America or 8–9 hours from the UK, most people feel noticeably better after three or four days, but full adjustment can take about a week or longer.

Is it better to sleep or stay awake when I land in Tokyo?

The CDC suggests short naps of 20–30 minutes if you need them, because long daytime naps make it harder to sleep at night. Most travellers do best by staying awake until a normal local bedtime, getting outdoor daylight during the day and keeping the evening dim and quiet.

Can I buy melatonin in Japan?

Melatonin is treated as a medicine in Japan and is not sold in drugstores as a supplement. If you want to use it, bring it from home, check Japan’s personal-import rules for medicines before you travel, and talk to your doctor or pharmacist first, especially if you take other medicines.

Why do I wake up at 4am in Tokyo?

Your body clock is still running on home time, so your internal “morning” arrives in the middle of the Tokyo night. This is very common in the first days. Many visitors use the time for an early riverside walk or a quiet shrine visit, then pace the rest of the day.

Does acupuncture cure jet lag?

No. There is no good evidence that acupuncture shortens jet lag, and Fuji Wellness does not offer it as a jet lag treatment. Some travellers book a session in their first days as a relaxing break or because of neck and shoulder stiffness after a long flight.