I won't do 1/2 days any more for this very reason, it's too stressful for all the children and for me. I did have a boy who was arriving at noon every day so he was basically here for 1/2 an hour that was our circle time but he wanted to play, nap, snack, 1/2 an hour of play and he was a really easy going kid but he wasn't getting my routine and rules because he wasn't here long enough. So the family changed their routines around (the Dad works midnights) and he started coming full days and I learned a lesson!