In slow-wave deep sleep, our glial cells rinse cerebral spinal fluid throughout our brains, clearing away metabolic waste that accumulated in our synapses while we were awake.
Kod sporih valova u dubokom snu,  naše glijalne stanice čiste cerebralnu spinalnu tekućinu po čitavom mozgu odstranjujući metabolički otpad koji se nakupljao u našim sinapsama dok smo bili budni.