I think the brain is such a mystery. It is too easy to make assumptions, I read a book by Bruce Lipton, quite a long time ago explaining the brain is plastic in as much as it reforms pathways if some get overloaded. I like your expression reboot. With my husband so much depends on energy levels not too much and not too little. I feel is is like a see/saw with me moving to balancing both ends! Days vary so much. We are dealing with a condition Vascular so we have 'platforms' but these are not smooth. I do not know what caused the condition to start, we lived a healthy lifestyle. I smile ruefully when I read of the advice to avoid dementias. I was told that it could have been worse depending on which part of brain is affected.