Here's one from the early 20th century: https://nautil.us/read-the-lost-dream-journal-of-the-man-who...

There were indeed dreaming of school:

> I am an assistant professor. Suddenly I receive express orders from the dean to teach osteology at the very last minute. Anxiety, anguish * * * when going over the bones in my memory. I enumerate those of the hand: scaphoids, capitate, and I did not know any more. Meanwhile the class awaits me, the students yell. I ask to myself how I will lecture about bones if I have almost forgotten them? Growing anguish and I awaken with a sense of well-being, upon realizing that I am not a professor, I am old and no one is directing me.