something that you need to consider is the total weight of the furniture and people on the bedroom, a really interestig experiment is to place 8 or 9 people in a very tiny space in the center of the room and see if the foor bows, or makes a sound (in case of wood floors) of course it won´t fall down but it can orientate you. A normal conrete floor can suport more than a couple tons in its weaker part.