"I'm tiiiiiiiiiired," seemed like a declaration that we'd hear endlessly, but it's followed mastodons into the ice. It's revived occasionally, much like the inquiry, "Why?"
Despite stubbornness about going to bed, Beren is increasingly communicative with our adult friends, telling them all about his projects. When they don't quite realize he's talking to them, I respond. To this, he shouts, "I'm not talking to you."
Please and thank you are making more sincere appearances in daily speech.
Bottom line, you win some, you lose some.