i don't know about your DD(who is so adorable,by the way!!)but owen is such a noisy sleeper!!he makes all sorts of noises, sighs,snorts and snores..even whinging..when he was first born my mum said he was 'chasing rabbits'(you know like dogs do!!)i noticed it heaps more when he was in our room..now i can turn the monitor down so that i only hear him when he wants me and its much better..but even just last night he kept me awake for much of the night even though he was asleep..he's just a very heavy sleeper i think!!
ETA : plus he never stops chattering when he's awake..maybe that has something to do with it?!?