Australia’s flag carrier airline, Qantas, claims to have discovered ways to improve passengers’ jet lag on long-haul flights. In a joint study with the University of Sydney, Qantas said that it is “possible to reduce the impacts of jet lag by reshaping the inflight travel experience.” Research conducted during test flights from Sydney to New York City and London found that “different lighting and sleep schedules, mealtimes, and specific ingredients like chili and chocolate during long-haul flights have been shown to contribute to improved traveler wellbeing,” Qantas said. The research reported said that those on the flight experienced less jet lag and better sleep quality during the journey.
https://www.washingtonpost.com/travel/2023/06/17/qantas-jet-lag-research-sydney-new-york-flights/