Her sleeping "patterns" are bothering you and taking up too much head space. I look at it the same as having a dream. It is not intentional, and you should not give it any meaning. Is there a spare bedroom?
If there is going to be an in-house separation.....then by gosh, start behaving as if you are separated. Can you do that, Mr. Nice Guy? Obviously. what you've been doing hasn't worked. It's time to really apply the last resort technique.
Seriously, you have to stop being Mr. Nice Guy. Which do you want more, to save your family......or always be seen as this nice guy with your W & kids? I think you need to honestly answer that question for yourself. There is a time and place for a man to be gentle, but I promise you it is never the time & place.... whenever you dealing with a wayward W. And, you have a daughter taking cues from her wayward mother...….and a son who is learning how to be a man from you.
So, she basically gives you the bomb drop again, and the two of you go on as if nothing was said? That's what happened last time......and it wasn't successful. So, I suggest you 180 from the previous blueprint.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!