Thanks everyone for your comments! I've read on all nurses about nurses getting injuries like neck, back or leg problems from working as a nurse. Someone said they can't return to work.
I've also read someone's post about how they work in emergency. They said that they have worked with nurses with a black eye, broken arm and a fractured hip from violent patients and that they have worked with/seen nurses kicked, punched and spat on. They said that some nurses have even left the profession due to the injuries that they have suffered or are being overexerted/burnout from work.
I thought it might have been how well you care for yourself but then I found websites like this: shift Work: https://www.webmd.com/sleep-disorders/features/shift-work#1
I also found this (fitness for practice as a nurse):