Jet lag is a resulting disorder of flight travel across several time zones. Circadian rhythms, the approximately 24 hour system that our bodies follow, become distorted following such a trip, as the body’s internal biological clock has not yet caught up to the current local time zone. Time cues and other external factors are necessary to adjust the clocks and reverse the negative effects of jet lag.
Melool, S. (2016). Jet Lag and the Biological Clock. The Science Journal of the Lander College of Arts and Sciences, 10 (1). Retrieved from http://touroscholar.touro.edu/cgi/viewcontent.cgi?article=1017&context=sjlcas