I really don’t understand how any of it works, but I’ve seen science articles about how your brain basically gets “washed” by spinal fluid while you sleep. My question is basically 2 parts.
1. Why do you have to sleep for this to happen? and 2. If sleep is a requirement, how does your brain clear the parts that are still working while you sleep? Your brain controls all your functions while you sleep and even continues to recognize sounds, ignoring unimportant things but waking you for other things. If sleep is needed for the rest, why not for the parts of your brain doing these functions?