I've had dreams in cartoon universes before. My dreams are often random and surreal enough that my mind doesn't really distinguish between animation and live-action. So, say, something like Cera living in my apartment (which Impractical and I have joked about before

) would be a plausible thing for me to dream about, even if it's hard to picture when you really think about it (since she's a cartoon, how would that look in the live-action world, etc.).
Coincidentally (or not?), after I made my previous post I went to bed to have a nap, and I so happened to have an LBT dream, albeit not inside the LBT world itself. I dreamt I was seeing
The Land Before Time in a movie theatre. The theatre wasn't super-crowded, but there was still a good number of people there, and I was pleased to see that there were other adults like me who had come by themselves to see the movie. Seeing LBT in theatres is something I actually did experience about a month and a half ago, and we had a discussion about that
elsewhere on the forum recently, which is probably what inspired this dream of mine. Although in the dream, there were some details that were changed around. There were more adults (and conversely, less kids) in the theatre in the dream than there were at the real-life theatre I went to. Also the theatre itself; there's two movie theatres in the city where I live, but in the dream the theatre looked completely different from both of them.
And... now that I'm remembering, I can in fact recall another LBT dream I had a few months ago. I dreamt that the Gang of Five got transported from the prehistoric days to the present-day world. Specifically, they wound up in my city somehow. My city is adjacent to a bunch of coulees and so the dinosaurs were wandering around the city edge that connects to the coulees. It was quite scary and confusing to the Gang to wind up in this strange unfamiliar world with all these humans around, and conversely everyone in the city was alarmed to suddenly have these dinosaurs appear. Littlefoot in particular got separated from his friends, and he was crying because he was lost and alone and didn't know what to do. Poor guy.
The inspiration for that dream might've been the movie
We're Back! A Dinosaur's Story. I can remember seeing it as a kid, and I recall it had a somewhat similar plot to my dream.