Amazing how science keeps finding out things but if you have ever had jet lag you would want to do whatever you can to help this problem.  Seems like it takes one day to adjust for one hour.  So when an El Pasoan goes to Europe,  it is like 8 hours different.  You are ready to come home by the time the jet lag wears off.

http://www.wsj.com/articles/study-points-to-a-way-to-prevent-jet-lag-while-you-sleep-1454966199

Seems like flashing light when you are sleeping at the end of your sleep cycle can help move this two hours.  It may even work early in the sleep cycle to move the clock backward and can help the teenager that wants to stay up till 2 in the morning.  It seems our clock is closer to 25 hours but the day is only 24.  I suspect the moon is involved somehow.

http://med.stanford.edu/news/all-news/2016/02/study-finds-possible-new-jet-lag-treatment.html