His bed isn't comfortable.
In his defense, it is a playpen with a thin, hard little mat. He stopped needing to nurse to resettle, but he still wanted to come to our bed. Once on our mattress, he would curl up and fall right back to sleep. A couple other moms said their babies started sleeping better once they moved to their crib mattress, so we gave it a trial run. We still don't have a crib, though, so we pulled our spare twin mattress up next to our bed and let him sleep on that. He slept soundly and happily, only waking to feed once or twice all night (which has always been usual for him.) We've had two nights of good sleep now, and I am feeling soooo much better. Sleep is a wonderful thing. When we finally figured it out, I thought, "Why didn't you just tell us?!" But then I realized he was trying awfully hard to tell us, and we just weren't comprehending. We need a crib, but I'm not sure when I'll have a chance to shop one out with the paint project in full swing.
His communication skills have become so much better over the last week. He definitely understands a lot of what we say. He will point at things he wants (or just has something to say about), come and tell me when he wants to nurse ("Na-na-na-na!" and pointing if I don't get the picture fast enough...so much for being discrete in public), or go to the door when he wants to go outside. Or if he's fussing, we can start listing options and when we hit the right one, he gets all happy and excited. I love it! It's like having a little friend around all the time.