You're asleep, you're dreaming -- you're really talking with someone else. Or fighting them. Or -- Dreams that are secretly (or openly) a form of two-way interaction. Harm can only come to the dreamer through psycho-somatic effects, or as mental damage. May shade into Dreaming of Things to Come, if the other person tells of or shows the future, or Dreaming of Times Gone By, for the past. Dream Spying is particularly likely to overlap, letting the dreamer see the present with the other as a guide. May be mistaken for Dreaming the Truth, or if a Dead Person Conversation, be indistinguishable.