code: func (b *bridge) Sleep(call otto.FunctionCall) (response otto.Value) {
  	if call.Argument(0).IsNumber() {
  		sleep, _ := call.Argument(0).ToInteger()
  		time.Sleep(time.Duration(sleep) * time.Second)
  		return otto.TrueValue()
  	}
  	return throwJSException("usage: sleep(<number of seconds>)")
  }
docs: // Sleep will block the console for the specified number of seconds.