CHILDREN who suffer appendicitis at night can have surgery postponed until the next day without any additional risk, a study from Dublin has shown. Any delay in removal of the appendix has in the past been associated with increased risk of perforation and complications, but a study from Our Lady's Hospital for Sick Children, published in the British Medical Journal, showed the rate of perforation and complications to be similar in both children who underwent surgery at night and those whose operation was delayed.