The ladies in the nursery were always happy and friendly. They knew my sons name after his first visit. Each time we dropped off or picked up we saw 3-4 cast members in the nursery with the children. They definitely keep to adult to child ratio low. My son would specifically ask to go to the kids club each day. This was a good sign to us, he liked it!
The cast members will monitor your child for different things. If they see that they are sleepy they will have them lay down in a crib or cot. When we registered our son they ask us various questions about toilet training, sleep habits, food allergies, etc. My son took a nap on the day we had the mixology class. We went to pick him up and he had just laid down to sleep, so we left him there and had them page us when he woke up. We laugh because of the way they had paged us on the Wave Phone "Please collect your child!"