A rule of thumb is that you recover about 1 hour difference per day. Recovering from jet lag is a process that, well, takes time. But that only works within about 4 or 5 hours difference. A flight from New York to Tokyo, on the other hand, leaves you with a 13-hour difference, which effectively means reversing your sleep/wake schedule.įlights from east to west, where you gain a few hours, are usually a bit easier, as most people find it easier to stay up a little later than to go to bed earlier. Flying from Paris to Johannesburg, while it might take you 15–20 hours, wouldn't leave you very jetlagged because there's only 1 hour time difference. Where flying isn't concerned, it isn't the length of the flight that matters. The fatigue from travelling plus the mismatch with local time can leave you ready to fall asleep just after lunch, or being wide awake in the middle of the night, knowing that dawn is still several hours away. Jet lag is also compounded by the fact that long hours spent on a plane can cause you to sleep too much, or not enough, possibly at the wrong time of day relative to where you departed from. It's caused by rapid travel across time zones. Jet lag is a mismatch between your body clock and the local time wherever you are. If you travel has time zone complexities or possible impacts on your health or comfort, consult an expert as you plan it. If starting the reverse course by midday, you may well arrive but a few clock hours more or less on the same calendar day. west coast to Japan or Hong Kong in late evening can land you there in the morning two calendar days later.
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