They still had clear boundaries. They slept in the sleeping place and at the sleeping time, they worked at the working place and at the working time. See, they didn't have smartphones to fiddle with in bed.
This is solvable for people who want to. We have a dedicated charging station in our house for all electronic devices. Before bed, all of those devices get put there. Including me and my wife's phones.
Living as if it might happen any time and I must be available for it is not healthy IMO.