During college, when my EE internship placed me in a manufacturing line job that was somewhat repetitive (not very repetitive as repetitive goes though), on the second day, I distinctly remember I felt like my brain was dying. It was not a good feeling.
So can confirm.
Fortunately, my manager saw sense and made me write some Turbo Pascal instead the day after.
https://www.cnn.com/2024/04/17/health/brain-job-dementia-wellness/index.html