I think he likes to read the book as he falls asleep. The book is "Walter the Farting Dog," a delightful tail (pun intended) on accepting the limitations of those you love. It's recently become his favorite book, and he's well on his way to memorizing it. I've read it to him every night for the last week or so. My reading of the book and his sleep osmosis means that he knows that Walter farts when he eats, when he sleeps, and we he plays, and that Walter gets the blame for everybody else's farts, too.