Australians have it worse for jet lag than almost anyone else on the planet. Getting to Europe requires crossing 8–10 time zones. Getting to the US east coast means jumping 15–16 hours (or crossing the date line the other way). Even a short trip to Japan involves a 1–3 hour shift that somehow manages to disrupt sleep for days. Here's what the science actually says about recovering faster — no pseudoscience, just the strategies with real evidence behind them.
Try it: Use our Jet Lag Recovery Calculator to estimate your recovery time and get a personalised adjustment plan for your specific route.
Why Jet Lag Happens
Your circadian rhythm is your body's internal clock, running on roughly a 24-hour cycle driven by light exposure, meal timing, and activity patterns. When you cross time zones rapidly, your internal clock remains set to your home time while your external environment — light, meals, social cues — operates on a different schedule. The mismatch is jet lag.
The symptoms you feel (fatigue, poor concentration, digestive issues, insomnia at unusual hours) are your body's regulatory systems operating at the wrong times. Your cortisol peaks at the wrong hour, your melatonin releases when you need to be alert, and your digestion expects a meal when local time says it's 2am.
Why Eastward Travel Is Harder Than Westward
This is one of the better-established findings in circadian biology: most people find eastward travel (the direction you travel going from Australia to the UK via the Middle East, or from Australia to the US east coast going eastward over the Pacific) more disruptive than westward travel.
The reason relates to the natural length of the human circadian cycle, which averages slightly longer than 24 hours (closer to 24.2 hours). It's easier to extend your day (as you do when travelling west — making the day longer) than to compress it (as you do when travelling east, essentially advancing your clock). Flying Sydney to London via Dubai is an eastward journey of about 10 time zones; London to Sydney is a westward return of 14 time zones but is often reported as less disruptive.
The Science of Melatonin and Light
Two tools have the best scientific evidence for accelerating circadian adaptation:
Light Exposure
Light is the most powerful circadian zeitgeber (time-giver). Morning light exposure at your destination advances your clock (helps eastward travel). Evening light delays your clock (helps westward travel). The key principle: expose yourself to bright light at the times that match your destination's morning, and avoid light when you're meant to be asleep.
On arriving in London from Sydney (eastward, 10 hour advance needed): seek bright morning light at the London morning time, even if your body thinks it's evening. Wear blue-light blocking glasses after 8pm local London time.
Melatonin
Low-dose melatonin (0.5–3mg) taken at the destination's target bedtime is well-supported for jet lag recovery. The key is timing: melatonin taken at the right time (bedtime at destination) helps phase-shift your clock. Melatonin taken at the wrong time can make jet lag worse.
Melatonin is available over the counter in Australia as a supplement in lower doses. Doses above 2mg require a prescription (Circadin slow-release). The lower doses (0.5–1mg) are often more effective than the high doses found in US products, which can cause grogginess.
Route-Specific Guides
Sydney to London (10-hour advance, eastward)
| Timing | Action |
|---|---|
| 3 days before departure | Move bedtime 1 hour earlier per day; get morning sunlight early |
| On the flight | Set watch to London time immediately; sleep when it's night in London; avoid alcohol; stay hydrated |
| Arrive London (usually morning) | Stay awake until local 9–10pm regardless of fatigue; get outside in the light |
| First night in London | Take 1mg melatonin at 10pm London time; sleep in a dark room |
| Days 2–4 | Morning bright light, regular meal times, melatonin at bedtime if needed |
Sydney to New York (15-hour difference; best to travel westward via LAX)
Sydney to New York via Los Angeles is a westward journey of 9 time zones — significantly easier than going east over the Pacific. Flying SYD–LAX–JFK means you're travelling west with the sun, which most people find more manageable.
| Timing | Action |
|---|---|
| 3 days before | Gradually delay sleep time by 1–2 hours per night |
| On the flight | Stay awake for most of SYD–LAX leg (it arrives daytime); then sleep SYD body-night on LAX–JFK |
| Arrive New York | Usually arrives late afternoon/evening; stay awake until 10–11pm local; avoid long naps |
| First 2–3 days | Avoid early morning light (delays body clock adjustment); evening light is fine |
Before You Fly: Adjusting 3 Days Out
The most evidence-supported pre-travel strategy is to shift your sleep timing by 1–2 hours per day in the direction of your destination, starting 3 days before departure. For eastward travel (Australia to Europe), sleep progressively earlier. For westward travel (Australia to Americas), sleep progressively later.
This is inconvenient but effective: by the time you board, you've already shifted 3–4 hours toward destination time, reducing the total adaptation work required at the other end.
On the Plane: What Actually Helps
- Set your watch to destination time immediately on boarding. Mental alignment matters.
- Sleep when it's night at your destination. Use an eye mask, neck pillow, and earplugs. Don't watch movies during your destination's night just because you're awake.
- Hydration: Cabin air at 12% humidity is extremely drying. Drink 250ml of water per hour as a rough guide. Dehydration worsens all jet lag symptoms.
- Alcohol: Avoid or minimise. Alcohol disrupts sleep architecture (reduces REM sleep quality), dehydrates, and blunts melatonin response. The free business class wine is tempting but counterproductive.
- Meal timing: Try to eat at times that match your destination schedule. Skip the meal service if it falls at an awkward time and your airline allows it.
- Caffeine: Use strategically — caffeine blocks adenosine receptors and temporarily suppresses sleepiness. On a night flight, avoid caffeine for the 6 hours before your intended sleep window.
At Your Destination: The First Day
The most important rule for the first day at your destination is to stay awake until local bedtime, even if you feel terrible. Going to sleep at 2pm local time because you're exhausted will set your clock to 2pm bedtime and make every subsequent day harder.
Get outside. Natural light is the single most powerful tool available, and it's free. A 30-minute walk in bright daylight at the right time of day will do more than any supplement.
Jet Lag Tips Ranked by Evidence
| Strategy | Evidence Level | Practical? |
|---|---|---|
| Light therapy at appropriate times | Strong | Yes |
| Low-dose melatonin at bedtime | Strong | Yes |
| Pre-travel sleep shifting | Moderate–strong | Inconvenient but effective |
| Staying awake till local bedtime | Moderate | Difficult but important |
| Avoiding alcohol on flights | Moderate | Yes |
| Hydration | Moderate (for symptoms) | Yes |
| Homeopathic jet lag remedies | No evidence | Placebo only |
| Anti-jet lag diets | Weak evidence | Not practically supported |
Frequently Asked Questions
How long does jet lag last after flying to Europe from Australia?
Without any countermeasures, jet lag from a 10-hour time zone crossing typically resolves in 7–10 days. With the strategies above (light, melatonin, sleep shifting), most people adapt significantly within 3–4 days. Some people never fully adapt on short trips — the reason many travellers feel human only as they're about to fly home.
Is business class better for beating jet lag?
A flat bed makes sleeping on the plane dramatically more achievable, which does help with adaptation. But the class of travel matters less than sleep timing — you can adapt well from economy if you sleep at the right times, and poorly from business class if you stay awake watching movies through your destination's night window.
Should I take sleeping pills on long-haul flights?
Only on medical advice. Prescription sleep aids can cause disorientation on waking (sleep inertia), and there is some evidence of increased DVT risk from immobility during chemically-induced sleep. If you struggle to sleep on planes, improving your sleep environment (mask, earplugs, neck pillow, window seat) is a better first approach than medication.