 Wia dis foto come from, Getty Images Wetin we call dis foto, Matt Walker na brain scientist wey dey study why human beings need sleep So wetin dey happun when your bodi lack sleep Oga Walker say, Sometin dey di left and right side of di brain wey dem dey call di hippocampus, and na wetin dey collect information wey pesin learn, store am, we find say wen pipo no sleep, signal no go dey for dia to accept new informate or build memory again. 