Node.js HTTP sleep server Simulate HTTP Timeout error

HttpSleeper.js

var http = require('http');
var sleep = require('sleep');
var timeout = 100000; //sleep 100 seconds

http.createServer(function (req, res) {
    setTimeout((function() {
      res.writeHead(200, {'Content-Type': 'text/plain'});
      res.end("Hello I am awake");
    }), timeout);  
}).listen(8080);

Nice! But I don't see any use of the sleep module. I've removed it and it still works fine.