Iron Skillet, thanks for that reference. Yes, that certainly is interesting reading and I agree that it might be just that, the placebo effect. What's the answer; don't do shift work, fly long haul, or stress to much. In these modern times it is harder to avoid and certainly with the demand on schedules it's not likely to change.
It really is indicative of our business and I hazard to guess they are going to want more productivity but will not balance that with the detrimental physiological effects of Long Haul/Back of the Clock Flying.
In order to cope, people will use strategies like sleeping tablets, melatonin and even the magnetic bracelet, if that helps them. All about treating the symptoms and not the cause, unfortunately.