[[Two figures are walking and talking to each other.]] Figure One: Humans are defined by our curiosity, our hunger for answers. Figure Two: We all spend a third of our lives lying down with our eyes closed and *nobody knows why.* Figure One: ...touché. {{Title text: Stanford sleep researcher William Dement said that after 50 years of studying sleep, the only really solid explanation he knows for why we do it is 'because we get sleepy'.}}