When I was a child about 5 years old, I was sleeping in my parents bed for some reason (probably a storm). Mom was awake, dad and I were asleep. Suddenly my father and I have this cross-sleep conversation while my mom lays between us, quietly freaked out:
"Dad, you better not take my toys!" I mutter angrily.
"Ok, I won't" my father responds.
"Don't even touch them."
"Ok."
Not particularly scintillating conversation, but notable for the fact that were both asleep and still responding to each other. It was like making Alexa and Siri talk to each other lol