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🇯🇵 → 🇦🇺 Tokyo to Sydney jet lag: what to expect and how to adjust
How bad is jet lag on this route?
The time difference between Tokyo and Sydney is about 1 hours (it varies with daylight saving time), and the flight takes about 9.5 hours. Without a strategy, expect roughly 1 days for your body to settle into local time. Pre-trip shifting and well-timed light can make those days much easier.
Which way does your body clock shift?
Your body clock needs to shift earlier. Because the human clock runs slightly longer than 24 hours, advancing is the slow direction — about 1 hour per day.
Light timing matters most
Bright light is the strongest lever for moving your body clock — but light at the wrong time moves it the wrong way. After large eastward hops, the standard advice is to avoid bright morning light for the first days and seek light only after your body temperature minimum (about 3 hours before your usual wake time). The planner computes these seek/avoid windows for each day.
Caffeine and naps
Cut caffeine 6 hours before your target bedtime — a controlled study found even a dose 6 hours out shortened sleep by about an hour. If you must nap, keep it to 20–30 minutes and not in the late afternoon.
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