Refactored version of my menu-toggling script.

menu.js

(function($) { // Use a wrapper since WordPress loads jQuery in noconflict mode

  // Menu Toggling
  $(document).ready(function(){
    var sidebar = $(".sidebar");

    $(".toggle").click(function(){
      var $this = $(this);
      if ($this.hasClass('open') ){sidebar.toggleClass("active");}
      $(".sidenav").toggleClass("inactive");
      setTimeout(function() {
        $this.addClass("hide");
        $this.siblings().removeClass("hide");
        if ($this.hasClass('close') ){sidebar.toggleClass("active");}
      }, 500);
      return false;
    });
  });

  // Make menu sticky if scrolled
  $(document).scroll(function() {
    var scrollpoint = 176; // Set point at which nav becomes sticky
    var sidebar = $('.sidebar');
    var sitenav = sidebar.find('.sitenav');

    var top = $(document).scrollTop();
      if (top > scrollpoint) {
        sidebar.css({'position' : 'fixed', 'top' : '16px'});
        sitenav.slideDown(); // Reveal main site page nav (hidden by default)
      }
      if (top < scrollpoint) {
        sidebar.removeAttr('style');
        sitenav.slideUp(); // Re-hide main site page nav
      }
  });

})(jQuery);