Having come across this article, "Sleepy medical staff run increased risks of accidents driving home after a night shift", I couldn't help but be struck by two obvious questions.

(1).  Since when does being a medical staff member make any difference in the risks of driving while sleep deprived?  If it doesn't matter, then it seems that the study is being unnecessarily specific for something which is common, obvious knowledge.

(2).  More importantly, if the risks are dramatically higher for "sleepy medical staff", one has to wonder what the risks are to patients. 

It would seem that perhaps the most significant problem highlighted in this whole study is the question of why the medical community can be so woefully ignorant of the need for sleep.  Now that's a topic worth studying.