Delay based in jQuery Deferred object.

delayPromise.js

(function (window, scope, undefined){
  "use strict";
  
  var $ = window.jQuery;
  
  scope.delay = function (timeout){
    var $d = $.Deferred(),
        t = timeout || 0;
      
    setTimeout(function (){
      $d.resolve(timeout)
    }, t);
        
    return  $d.promise();
  };

}(window, scope || window));

Usage:

    function callback(t) {
      // do stuff here 
      /*you can return a new instance to make a new step, 
      also can update the sleep time or use the previous as shown
      */
      return delay(t);
    }

    delay(timeout).then(callback).then(callback).then(callback); // example