I think brain can be thought to behave like a muscle and skeleton. If you put it under stress(learning) and let it recover(sleeping) it improves and grows stron

I think brain can be thought to behave like a muscle and skeleton. If you put it under stress(learning) and let it recover(sleeping) it improves and grows stronger. Similarly if you let it idle, atrophy hits and it weakens. Just like muscles and bones do. Both can be trained with consistent and proper effort.