Secondly, criminal matters aside, serving time in prison is the equivalent of living within the rules, and it can even be said that, except for the content of the dream, there are rules for everything else, which must be followed, or else you will inevitably be punished. The Shawshank Redemption, where the old Bruce, who only got out of prison at the end of his life, had to shout out a report before going to the toilet during his time working in the supermarket, is also very graphic, and is the inevitable result of living within the rules for a long time.
Once again, most people who have served a long time have a kind of woodenness that we outsiders can relate to, because of the disconnection from society, good at obeying, good at carrying out orders, not too many words of their own, more often than not, silence.
Simply put.