As time progresses, people in the workplace are expected to do more with fewer personnel. As are result, we are seeing more people experience stress problems leading to ill health and burnout. People can be burned out because they're under pressure to produce more. One can spend 80 hours at work and have no life. Saying no to extra work from those who work less than you do.
Covey suggests bringing up the problem during a calm time at work as a good approach.
Tell the folks about your problem in a non-accusatory way. Let them know that you are afraid that if you have to continue to work so many hours extra with out having a life outside of work, you may grow resentful and it may affect the relationships at work. Let the others express their problems and see if some solution can be reached. When this cannot be accomplished, do the best you can and let the chips fall where they may. The perfect job isn't a standard of living.