Exercise also helps clear lymph from most of the body which seems to help the brain clear it while sleeping, at least anecdotally. See also this comment:
https://rothschild.shinyapps.io/AMPK_dashboard/
Fun to play with.
I noticed that she is a lot sharper now. Previously, she would forget something in a conversation or ask twice. Now she is absolutely here and if we for example discuss some video, she mentions details that I overlooked.
That was quite a change.