I think you have to discuss it with your husband and try to get together more. It does not sound like a good spell for you, personally, or the marriage, if he's away and you're working night shift (while he's sleeping).

But your husband's enjoying porn is not about you. It is about his sexuality. I would discuss the subject and your relationship and see if you cannot get a more mutually/balanced marriage going with time doing things together. Sometimes physical love has to be "arranged" but in order to do even that, one has to think about it and commit to it, etc. I did not get enough sleep last night to want to fool around this morning but it's like a "rain check", I love my husband and enjoy being desired and desiring him, etc. and will make time in the near future.

It's "just" sex in the sense it would be like saying, "fix your own dinner dear, I'm too tired to" all the time to the other person (or they, to you) but it's also about the relationship quality and communication. "Finding out" is not how a relationship is supposed to work.