Did you have difficulty recalling work from one semester to the next when each course built upon the one prior? And quit calling me Shirley. (groan)
I don’t recall calling you Shirley?? When I was young, I had an almost photographic memory. However, after age 30 it started declining.
Throw in a little oxygen deprevation, and the ole brain just ain’t what it used to be. That old saying about not remembering because you’ve slept since then, has lots of truth.