Does it? In a healthy couple you might not ask "how did you sleep, my love" because sleeping together means you have a ballpark idea of how sleep went even before asking (and you can look at the face of the other person), but that doesn't mean sweet messages aren't exchanged: delicate good morning kiss, "hello" said with a tone that conveys "happy to see you", "I missed you tonight" (when she goes to sleep with the kids), "it makes me happy for waking up near you" and so on.