Falling asleep inside a dream is read as a deep need for rest, or as withdrawing from a situation you would rather not face. Dream books also see it as a layer of the mind going even further inward.
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.