Hmm...I always took that as the wife and mistress kept apart. I should try to remember what manga that was, and exactly what she said. Maybe Lirin just woke up earlier? In all honesty, I mostly remember it because it made me wonder if she had plans for a Big Reveal about Lirin.

Course, the only authors notes things I remember is that, and a comment in I think the first volume where she said Gojyo was looking for the right person, but it might not be a girl.