Déjà vu inside a dream is read as a pattern repeating — a sense that you have been here before. Tradition links it to familiar situations returning and to lessons that come back until they are learned. Recognising a place you have never seen is read as an old feeling attached to a new setting, while reliving a conversation word for word points to a habit of reacting the same way. Some dream books treat it as a mind sorting memories. It describes recognition, not knowledge of anything to come. It can help to notice which situation in your life keeps feeling strangely familiar.
Where in your waking life have you met something like this lately?
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.