On Hypothesis 3, the brain may build up waste as a byproduct of its metabolism when it’s working harder than normal, just as muscles do. Cleaning up this buildup seems to be one of the functions of sleep. Even brainless animals like jellyfish sleep. They do have neurons though.
On Hypothesis 3, the brain may build up waste as a byproduct of its metabolism when it’s working harder than normal, just as muscles do. Cleaning up this buildup seems to be one of the functions of sleep. Even brainless animals like jellyfish sleep. They do have neurons though.