Our body's circadian clock system is affected by many factors, one of which is light. Research shows that light can effectively deceive the brain into day mode, even if people's eyes are closed at that time. Researchers have found that light therapy can help us adjust jet lag, including continuous light and flashes at different intervals, The study also found that people who experienced flash processing during sleep delayed the cycle of sleepiness by two hours.
It takes a long time to adjust your jet lag by yourself, and on average you can only get an hour's jet lag every day, best supports the above view.