Jet lag is read as being out of sync after a big change, with body and mind arriving at different times. Tradition links it to disorientation and the need to adjust your rhythm.
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.