A retreat is a deliberate step back from the noise, and dreams of one are read as a need to withdraw and recover. It can also describe pulling away from a situation that has become too much.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.