Jet lag

Nowadays,it is possible to travel to distant parts of the globe in several hours.This can result in the traveler ending up in a part of the world where time is different from his or her own"body clock",which controls our sleep patterns.If we travel east or west by more than four time zones(hours)then we will usually be affected.In the past when people traveled by sea,there

Nowadays,it is possible to travel to distant parts of the globe in several hours.This can result in the traveler ending up in a part of the world where time is different from his or her own＂body clock＂,which controls our sleep patterns.