best piece of advice: HUMIDIFIERS....or any noise makers. I used them with my own kids who are close in age, so noone would be woken up (early morning feedings etc) and I swear by them for daycare naps as well. I use the 3 bedrooms of my house upstairs and separate them as best I can...depending on the best matches, but right one is having a major power struggle, non-napping phase, and she can cry as much as she wants...no one hears her