Here is one for all the world travelers. Melatonin may be an effective solution for your problems with jet lag. A review of ten studies on the use of melatonin concludes that two to five milligrams of melatonin taken at bedtime after arrival at your destination is effective and may be worth repeating for the next two to four days. This should be done in conjunction with nondrug measures- such as avoiding dehydration and alcohol, engaging in exercise and activity during daylight hours, eating well, sleeping well, and adjusting to the local time schedule- for fighting the dreaded jet lag.

From: Why Do Men Have Nipples? By Mark Leyner and Billy Goldberg, M.D.