This was my first interpretation, then I read the discussion and thought I was wrong, then I rolled back around to thinking maybe I was on the right track after all, haha.
その夢にあんたもいたと妻が泣く
“you were there
in my dream as well”
cries the wife
As far as interpretations go, a lot of these seem to be about relationship drama, so my first thought was that the wife was talking about a dream she had (if it’s a literal dream, maybe it involved some hot celebrity or something), and she had to clarify to her spouse that they were in fact also included in the dream so that the spouse didn’t get upset or offended.
I like the explanation being that your husband appearing in your dream means the opposite of the dream will happen in real life, though. I prefer that one 