Noctis is only grateful that the Tidemother helped save the train from the daemons. That is literally it. But instead of thinking about it more, he's already finding his eyes blinking closed.

"Get some... rest too, Specs." He said, trying to hide a yawn there and quite unsuccessfully. His eyes drift closed as he prays for a dreamless sleep, slowly leaning on Ignis as he dozes off.