function isNight() {
    var als;
    als = Qt.createQmlObject('import QtMobility.sensors 1.2; AmbientLightSensor { }', this, null);
    als.start();
    if (als.reading.lightLevel == 1 || als.reading.lightLevel == 2) {
        als.destroy(1000);
        return true;
    }
    als.destroy(1000);
    return false;
}