People differ in how quickly they can reset their biological clocks to overcome jet lag, and the speed of recovery depends on the direction of travel
Generally, it’s easier to fly westward and lengthen your day than it is to fly eastward and shorten it
This east-west difference in jet lag is sizable enough to have an impact on the performance of sports teams
Studies have found that teams flying westward perform significantly better than teams flying eastward in professional baseball and college football
A more recent study of more than 46,000 Major League Baseball games found additional evidence that eastward travel is tougher than westward travel