I keep having some CNC fantasies, things like being woken up fucked or being fucked while under hypnosis. I don't understand why it turns me on so much
Only you or a therapist can answer that question. However, what I can say for certain is, you aren't alone in having this fantasy. I've never heard of doing it while under hypnosis though
There could be tons of reasons, but strangers on the internet won't be able to tell you. We may be a safe place to admit it while you work through it, but only you can know the answer.
If it's bothering you, a therapist focused on trauma would probably be the way to go.
If you just want to explore it sexually, there are stories and probably a number of people here willing to try.
Follow Sweetestgirlem's advice about real life. Be very careful, have safe words in play after LONG conversations. You need to have ultimate trust with anyone you might play with IRL. Know that this could go very bad, even with those things. Even if the partner does everything expected and stops if you need. Have conversations with them after (even if it goes well). Kinks are fine, even the more dark and taboo ones, but one needs to be clear and safe.