The Sabbath is rest made holy, a day the world is allowed to stop. Dreaming of it is read as a need for pause, family time and permission not to produce anything.
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.