Wow! It's been a long time since I did shift work, but that just does not seem right. I was the night supervisor for a 120 bed facility many years ago and we had 4 med nurses which was about 30 patients each. You are right, that is not a safe patient load. This is not about you " shouldn't be a nurse" but more about " I shouldn't be a nurse in this type of facility"! I don't know if there is an easy answer. If that is their policy, and it is within legal limits, I guess you are kind of stuck, but maybe you can garner some support from the other nurses and go to Administration. They may listen to numbers. Good luck!