Jet lag refers to the temporary lag of the jet lag that occurs due to the time difference in the destination point on long-distance flights. The jet lag is most commonly felt during daytime flights from west to east.
Within the 24-hour period, every cell in the body works systematically and adjusts itself according to the signals it receives from the brain. Quick time changes can disrupt this scheme. Passengers who change places between time zones may have a sleep disorder called jet lag.