english: Two thousand years ago, Galen, one of the most prominent medical researchers of the ancient world, proposed that while we're awake, our brain's motive force, its juice, would flow out to all the other parts of the body, animating them but leaving the brain all dried up, and he thought that when we sleep, all this moisture that filled the rest of the body would come rushing back, rehydrating the brain and refreshing the mind.
non_english: Galen, jedan od najznačajnijih lekara starog veka je pre 2.000 godina pretpostavio da se pokretačka sila našeg mozga, njegovo gorivo, dok smo budni sliva u ostatak tela i oživljava ga, ali isušuje mozak, a dok spavamo, sva ta vlaga iz ostatka tela se vraća, vlaži mozak i osvežava um.