There is a simple answer to these complex dreams. You are afraid of death, so you continually get up from sleep and walk around and do whatever, and then it is safe to go back to sleep again, until the fear of death returns, and up you get and walk around, etc. And here we go again, like on a merry-go-round ride at the circus in your head. Make peace with death. I have, and many other people have gone to great lengths to be at peace with the concept of death. Study philosophy or religion and follow the teachings calling to your heart and soul.
Personally, I find comfort and peace with the teachings of Jesus Christ.