Re: Working x# of shifts in a row ...
Can't say as I know any rules at our hospital re: how many you can work in a row. BUT - I would take it up with whomever makes out your schedule. 6 nights in a row (especially if they are 12 hour shifts ) can kick your butt pretty hard. Sometimes when schedules are made out, the scheduler isn't paying attention to some of those details. It isn't personal, just trying to get coverage going - make sure all the little boxes are filled in without looking closely enough as to the impact on the people involved. I had to do it for a while, and accidently had one poor nurse working a bunch of weekends in a row. As soon as she pointed it out, I apologized and could massage things around and do it differently.
Filling out the schedule is a thankless job and I'm glad I don't have to do it any more. It is SO hard to make everyone happy and still have the right mix of staff working, with enough to cover some mysterious census that is a month away from now. What a headache.
It can't hurt to ask to a)see if it can be done differently, and b)ask that it not be scheduled that way again in the future.
Good luck!