Avoid excessive alcoholic intake as this may predispose you to loss of inhibition of sexual behaviour. If you need a blood transfusion, ensure that the blood has been screened for HIV, Hepatitis B, Hepatitis C, Syphilis, etc. If you require injections and blood drawing, ensure that disposable needles and syringes are opened and used in front of you. This is a phenomenon that is experienced when a traveller crosses many time zones over a short period of time. It can start even with a 2 hour difference in time.
Symptoms can persist for a week or more.
It takes one day to recover from each time zone crossed, so give yourself sufficient time to adjust. Drink plenty of water before, during and after the flight. Avoid alcoholic and caffeinated beverages. Research has shown that melatonin therapy has positive effect in minimising jet lag but ongoing studies are needed to determine its optimal usage. It is helpful to take non-stop flights and to schedule departures in the morning.