I am old enough to remember when we were told sleep deprivation didn't make us work less efficiently, so it was okay to be on every three days (and a few years before I was an intern/resident it was every two days: Of course, in those days before ICU's, most of the work was drawing blood or starting IV's, not keeping severely sick people alive).
I have been on call and refused to see patients because I was so tired that I was hallucinating and couldn't think straight and went home to bed. UNPROFESSIONAL!
Yeah. I should have gone in and killed someone instead of waking up someone who had had some sleep do the work.