Cycling between day and night shifts means you'll die much sooner than you would if you didn't cycle, no matter what you die from. Numerous studies have shown that this causes many health problems, and those who do it die sooner than those who don't, regardless of the work they do. Why is it necessary to switch? Pay night differential, and get some of the pilots to work nights full time. Everyone is happier, healthier, and safer. But wait, the managers didn't think of it, so it makes no sense, so that won't happen. We'll just keep killing our customers, and let the insurance companies worry about the losses.
