The culprit: jet lag. They looked for jet lag's effects by analyzing 20 years' worth of Major League Baseball data. That's a reasonable idea, said Dr. W. Chris Winter, a Virginia sleep specialist who consults with several major league teams. Ballplayers know jet lag a problem, and have recently taken steps to ease the burden of their schedules. The Major League Baseball Players Association, concerned about fatigue, negotiated several changes in scheduling rules starting in 2018.

Source: Fox News January 23, 2017 20:28 UTC