// do something here

$.ajax({
  url:   "http://sleepy.apphb.com/sleep/1000", // sleep for 1000ms on the server
  async: false                                 // execute this request synchronously
});

// continue doing something here

// do something here

$.sleep(1000);

// continue doing something here

// sleep for the default amount of time, i.e. 1000ms
$.sleep();

// call the provided callback function when done sleeping
$.sleep(2000, function () {
  alert("Done sleeping.");
});

// call the provided callback function with the server response data
// currently there's one property, slept, which contains the time slept
$.sleep(2000, function (data) {
  alert("Slept for " + data.slept + "ms.");
});