[slg]

It that were the case, you would expect the danger to come towards the end of shifts and not from the changeover itself or beginning of new shifts. The problem is the passing of information. Some places operate on a 12 hour schedule and some on an 8 hour schedule. It isn't clear that the 8 hour schedule is actually safer because while workers are less tired, you increasing the number of daily handovers by 50%.

[watwut]

And meanwhile both 12 ams 8 hour schedule places involve people who were at work more then 24 hours or had massive overtimes last weeks.