It will get a bit of time getting used to it. And it is indeed really useful in the dark.

Whether it's the same thing as before or no, it doesn't matter. Something is interrupting Noct's sleeping pattern. And it will make Ignis worry about him regardless. Whatever that is on Noct's mind- Ignis hopes he will eventually be able to help him out with.

Once in the kitchen and Noct comfortably seated, Ignis moves to put coffee to brew. After it's done, he adds a generous amount of cream to it for Noct (he knows Noct hates bitterness of it) and places the mug in front of him and takes a seat as well.

"...is there something bothering you?" Ignis finally asks after a few long moments staring at the mugs.