jet lag.........

jetlag is a temporary disruption of the body s normal biological rhythms after high speed air travel through several time zones.. basically if ur staying in India and u goto america and for e.g there is a 12 hr difference in time.. then ur body is still working according to indian time. so when its day in america u might feel sleepy caz its night in India

the jetlag is the disease you have to travel around the world passing different time zones and so changing night to day you feel more stressed, imsonnia, there are some pills which give a certain relief