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
In cities where the time is two hours earlier, people who have received light therapy two hours before sunrise on the departure day have no sense of jet lag.
 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