Yes, I believe you, I have had those bad nights too. Sometimes that is not just about avoiding a noise or reminder, but experiencing a flashback of somekind that brings on a cycle that you have to be patient with until it finally passes. Sometimes after it runs it's course the reason for it is understood, other times that reason doesn't present itself, I hate those times tbh. I prefer it to be something I figure out because at least I can work on it consciously and acknowledge it and remind myself that yes I know, but that is not "now" and that helps to weaken it. When I don't get that, I tend to have these challenges until whatever it is connected to finally reveals itself to me. I have sure had to learn to be patient with this challenge, it's so hard to explain it to others unless it is someone who experiences the challenge themselves.