Sorry, I incorrectly assumed you were in medicine so the whole "this is all based on B.S. data" would have been self-evident.
The data from which the peer-reviewed empirical studies is flawed. I know, because I am the data. I -- and almost every other surgical resident I know -- routinely falsifies their work hours. Why we do this is a _long_ topic for another thread.
Please confirm with your local surgical resident; if you can find her. ;-)
People are lying about hours; therefore in peer-reviewed research, longer scheduled shifts led to lower rates of medical errors?