I have to say that I must disagree with datafone. In my opinion, dreams reach farther than we mere mortals are capable of in our daily life. I do agree with datafone that dreams are a cleaning station of the mind, put there to cleans the brain of brain chemical "pollution". There is scientific proof of the cleansing theory.
I just have to believe that there is more to dreams than just the cleansing of the brain. It is just the same as I can't look at the complexity and wonder of nature and not feel that there isn't a greater force involved. Not all, but some dreams have significance in our lives and possibly other's lives too.
As far as the frozen thing, it has happened to me. During a very trying time in my life, shortly before I retired early, I had a continual succession of dreams in which a fearful, unseen figure was always the leading figure in the dream. In every case i was unable to move to save myself. I was most often hiding under or in something and could not stir enough fearlessness out of myself to come out into the light. I very often screamed or yelled in these dreams because I could not move. Many times, when I yelled, I was, in reality and in the dream, unable to make a sound. I had been suffering from anxiety and depression at that time and it was not until I got some counseling, that the dreams finally stopped. I believe to this day that those series of dreams were there to warn me that I was in trouble and had to face the unknown specter, in order to heal myself.
Just one man's perspective.