The guy got up at out a dozen times between 1 AM and 4 AM.
We tried meditation. We got up and had water twice. He got up to pee another time and felt the need to let me know. He wanted to put on a hoodie. I offered him a robe instead. Later, he got me up to tell me the robe was too hot. I set up the old clock radio/white noise machine in his room. He called me to his room to move his Yoshi stuffed animal, which was too bumpy. (He could have done it himself.)
I didn’t want to be threatening, especially since this is partially the natural consequence of him sleeping until noon because of his stomach bug. But I ended up saying that if he woke us up again, I might me too tired to read any Lord of the Rings tomorrow.
Probably coincidence, but he went back to sleep after that.