I'm not sure anyone knows the answer to that in specific. In my experience, exercise is often followed by a nap and my inference is that clearing lymph from oth

I'm not sure anyone knows the answer to that in specific. In my experience, exercise is often followed by a nap and my inference is that clearing lymph from other tissues somehow encourages the body to also clear lymph from the brain, but I haven't actually found an explanation for how that works. You might find this general overview of the body's lymphatic system interesting: https://news.ycombinator.com/item?id=25427090 https://news.ycombinator.com/item?id=25427090