(require 'notifications)
(setq dbus-debug t)
(notifications-notify :timeout 1000)
(defun my-test ()
  (let ((ct (current-idle-time)))
    (message (format "idle time: %f"
                     (if ct
                       (+ (cadr ct) (/ (nth 2 ct) 1000000.0))
                       0)))))
(run-with-timer 1.5 nil 'my-test)