A thesis stands for a long piece of work that must hold up to scrutiny. It is read as commitment to an idea and the pressure of defending it before others.
When this appeared in your dream, what were you feeling?
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.