this article from the Guardian Scientists say we sleep to clean our brains The Guardian Email cleaning up debris www.theguardian.com experiment a physical cleanup theguardian.com The Guardian clean out our brains this article from the Guardian The Guardian summed it up sleep function clean out our brains Why Do We Sleep? To Clean Our Brains, Scientists Say They also note www.theguardian.com www.theguardian.com www.theguardian.com