During deep sleep, the brain sorts important experiences, filters out less important information, and clears waste products, potentially facilitated by increased space between brain cells.

“So what ends up happening in slowwave sleep in in the deep sleep the the the experiences from the day and all those new things floating around they sort of get sorted and the things that are important are kept and everything else gets let it gets let to fade. Interestingly, this similar thing happens where the spaces between your brain cells actually increases and like sort of like a like actually like a like a filter the it increases and actually waste products can start clearing out of your brain. Is it because you're thinking parts of your brain are working a little bit less and it gives it the chance to do that? Who knows? But it seems to happen specifically during that time just very protected the beginning of the night.”