code: function(){
              var i = 0
                  ,l = this._bodies.length
                  ;
  
              for ( i = 0; i < l; i++ ){
                  this._bodies[ i ].sleep( false );
              }
          }
docs: chainable
  Physics.world#wakeUpAll() -> this
  + (this): for chaining
  
  Wake up all bodies in world.