The Pirahãs say different things when they leave my hut at night on their way to bed. Sometimes they just say, “I’m going.” But frequently they use an expression that, though surprising at first, has come to be one of my favorite ways of saying good night: “Don’t sleep, there are snakes.” The Pirahãs say this for two reasons. First, they believe that by sleeping less they can “harden themselves,” a value they all share. Second, they know that danger is all around them in the jungle and that sleeping soundly can leave one defenseless from attack by any of the numerous predators around the
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