When people travel long distances by fast jet plane, they often get a confusion which is known as jet lag. The reason for this is because the modern aircraft travels so fast that they may cross several time zones in a short time during a flight. The cause of jet lag is the inability of the body of a traveler to immediately adjust to the time in a different zone. Thus, when a New Yorker arrives in Paris at midnight Paris time, his or her body continues to operate on New York time. It may take a couple of days for your brain to adjust.
It is considered a circadian rhythm sleep disorder, which is a disruption of the internal circadian clock. Our bodies have a sort of internal biological clock that follows a 24-hour cycle, called a circadian rhythm.
Recovering from jet lag depends on the number of time zones crossed while traveling. In general, the body will adjust to the new time zone at the rate of one or two time zones per day. For example, if you crossed six time zones, the body will typically adjust to this time change in three to five days.