Do they dream?

I'd love to know what Joanna and John dream about. We did have a little insight a few nights ago when Joanna started sleep talking. Her words were "John sleep" or "John Seat". So either she was persuading John to go to sleep, or was commenting on his little seat that he likes. As for John the only thing I can tell he dreams about is feeding - given the little sucking motions he does in his sleep. What do I dream about? More sleep.