I may be wrong, but when a person dreams of being physically confined it may have something to do with the way that you are sleeping. You may be sleeping in a position that is placing undue pressure on your neck, back, legs, or feet. This restrictive sleeping position causes you to dream of being physically constrained by someone or something that you cannot free yourself from.
This is an awful feeling of loss of self-control, frustration, and anger, emotions that you feel even after you have awakened from your dream. If my assumption is true, it validates my contention that many, if not all our dreams are the products of our life experiences, as well as our hopes and fantasies. What do you think? Let me know.