It happens to me all the time

Was this a lucid dream or no? If it was, I think it is important to expect/imagine it to change. Really think about the text changing, and not just look away and back at it mindlessly. If it wasn't a lucid dream, perhaps it would have to do more with awareness? Remember that expectation and imagination affect your dreams a lot! Hopefully if you practice more, this problem will be eventually solved

Good luck!