Playpens for the under 2 crowd. Over 2, a small airmattress on the floor or one of our beds, on top of the bedding, with their "own" blanket. I have not yet put more than one child in a room. I know it can be made to work, but I have often wondered how centres do it, with x-number of children in one room. How do the kids sleep? I guess they are coached/trained, just like any "non" nappers that we have?