Hi Jasper,

You can use the pause event.

For example, in the OnReady of the BottomBar insert there a Javascript statement with this:

document.addEventListener("pause", onPause, false);

function onPause() {
    $actions.<yourclientaction>();
}

This will run the <yourclientaction> when you exit from your application. In that <yourclientaction> you can insert in local storage a timestamp to know when it went to sleep. Then in the OnApplicationResume client action get that value to compute the amount of time the application was sleeping.

Cheers,

José