Years ago my son was in day care. The parents received notes saying that the children were being unruly and misbehaving and asked for the parents' cooperation to restore order. This note was sent out the week after Halloween-the week before, the week during, and the week after, the kids were eating lots of candy at school. Some parents even brought candy their kids got at parties or trick or treating to get it out of their house! I complained to the director and said I knew candy made my child hyper, and that as child development specialists training at the university, they should have know better. When the candy stopped, the kids calmed down.