We have finally figured something out on our own about our 11 wk old DS! He has been sleeping in a bassinet in our room since birth. I was getting discouraged b/c he was not sleeping "through the night" the way all of my friends' babies had at a much earlier age (7-9 wks).
A couple of nights ago I was extremely tired and decided not to pounce on him as soon as I heard the familiar grunts and kicking upon his waking. I thought that I would give it a few minutes and get up if he started fussing or crying. What do you know.....I woke up 3 hrs later to find he had put himself back to sleep!
All this time I thought he was waking up to be fed or changed and it turns out I was probably disturbing him! Thought this info might help those of you who have grunty, squirmy, loud sleepers.