K.W.
I, too, have the sharing room issue. We are in a two bedroom house with 7, 5, 2 year olds...all in one room. I have always sat in there with them until they are all asleep (although usually I fall asleep in the chair). When my youngest was first born, he was in a bassinet in our room until he was too big. Then he was in the pack-n-play in the living room for evenings while I got the other two to sleep. Finally, I got to where I could read (with two on my lap, rotating at each book), then put the older two in their beds (bunk beds), and continue to rock the baby. We also spend time talking about whispering (using a whisper to talk about it) and being polite to let the others sleep. Not a perfect system by far, but it works (mostly) for us. Good luck.