Our body's clock system is affected by many factors, one of which is light  Studies have shown that light can effectively trick the brain into daylight mode, even if people's eyes are closed  The researchers found that light therapy can be used to help us adjust jet lag, including continuous light and flashes at different intervals, while flashes lasting only 2 milliseconds every 10 seconds are the most effective
The darkness between each flash helps to restart the eyes, thus restoring their sensitivity to light
 The study also found that the cycle of drowsiness in people who experienced flash treatment during sleep was delayed by two hours