In my case, I suffered from this issue after a back surgery when some dumbass hospitalist read my chart wrong and told the nurse to cut off pain medication 10 hours after a spinal fusion. I asked the nurse for meds after she woke me up at 3 AM (to take my blood pressure and ask if my birthday had changed) and she refused and essentially accused me of shopping for narcotics.
When my surgeon checked in on me at the start of his day (5AM), he was shocked and got things fixed.
But couldn't this also be explained by said person lacking enough sleep?
Er, why? This reeks of a pretty serious administrative fuck-up.
When my wife was having our baby, the nurses had to log into three different systems -- an OBstetrics system, the hospitals charting/EMR and the pharmaceutical system. That meant going through the ritual 3 times.
A doctor can't necessarily predict how much time a patient will need. If a doc is on an 8-hour shift (hypothetical; I doubt any docs are so lucky!), and gets a new patient at the 6 hour mark, it might not be known if the patient will only be in the hospital for an hour, which would be fine, or 4 hours, which would push the doc to 10 hours.
As the argument goes, that patient is safer staying with the doc into his/her 10th hour on the job, versus being transferred to a different, fresher doctor midway through. I think there's enough truth there for it to be persuasive, but 1) there are limits to how effective a doctor is going to be after a certain amount of time, and the benefits of patient continuity must start dropping as the doctor has been working longer, and 2) there seems to be little attention paid to improving the process of handing a patient off between two doctors, which could further reduce problems related to lack of continuity to the point where a doctor who has been working 10 hours will cause more bad outcomes than shifting patients to fresher doctors would.
But that's a big part of the problem already. It shouldn't be luck to have an 8 hour shift, it should be standard. And of course there may be times when circumstances demand you deviate from that standard, but if you start with 12 hour shifts, you already start wrong, and it can only get worse.