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WE’VE ALL BEEN there after a long trip—staring blankly at emails, counting the hours until bed. Yet when 2 am hits, you’re still wide awake, mindlessly scrolling through Instagram, trapped in the grip of jet lag. That’s the price for crossing time zones too fast.
Our internal clock, or circadian rhythm, governs everything from sleep to digestion to hormones and uses light to maintain its natural 24-hour cycle. But when we land in a new time zone, and day suddenly turns to night, this rhythm is thrown off balance. Most travelers adjust within a few days, perhaps with the help of a melatonin pill. But in the meantime, jet lag affects sleep, mood, and metabolism.
A complete cure for jet lag is unlikely, but scientists have found ways to help our bodies keep up. “Even reducing jet lag by a day improves the productivity and well-being of so many people,” says Svetlana Postnova, a professor of neurophysics at the University of Sydney, speaking from over 10,000 miles and 10 time zones away.
Since 2015, Postnova has worked with Australian airline Qantas, which is set to launch the world’s longest flights in 2027, connecting Sydney to both London and New York, nonstop. These 19- to 22-hour journeys will offer passengers an unusual experience: two sunrises on a single trip. Or at least that’s what it should look like inside the cabin. This is where Postnova’s expertise comes in. “The timing of lights is key,” she says.
