Once when Ryan was around three or four he woke up in the middle of the night screaming, and when I asked what was wrong, he said "Dinosaur" with a tone of both terror and bewilderment. That's the closest he's ever come to revealing the contents of a dream.
I've always wondered, of course, what he dreams about. I've asked him, but he doesn't yet have the capacity for that kind of storytelling.
Last week, Dream was one of his spelling words. At school he used it in a sentence:
He likes to dream about the alphabet.