Most of my 12 months old nap in the am. So I put them down after snack which is around 9h30am and give them a solid hour or until they wake up by themselfs. During that time I do quiet activites wiht my older little guys. We have circle time, bake, color ..whatever. The PM nap start at 12h30-1h00pm and everybody sleeps in the same room. Now with my new babies still adjusting I keep the older ones out and they sleep in the playroom temporarly. Once the babies have the routine down everyone will sleep in the same room again. It's been working fine with me. Once in a while someone will break the routine but everyone gets use to sleeping in the same room no one is really bothered by it. They learn to keep quiet and look at a book. I think that no matter what your routine is, you just gotta be consistent and very patient and it will work out.