Tonks had the alien llama dream quite often. And her nightmares were usually her mother inside a crystal ball telling her that she'd bought her a cat, but named it Terpsichore. (Tonks also had a habit of eating before bed. This dream was relatively normal.)
"An adventure!" she repeated. "Whether it's aliens or inter-dimensional rift travelers, we're here to get to the bottom of this. I'm going to appoint you my adventurer-in-training partner. And I'll be your in-training alien investigative partner. Deal?" Yes, this worked out nicely. Since her dream son knew so much about the aliens, she figured it was best to let him tell her about them. Her dream people always knew more about the dream world than she did anyone. This was like one of those weird situations that muggles would make a movie out of. How exciting!