 We do not know our institutions actual incidence of emergence delirium for this operation. We will assume it to be 25 as suggested by the literature. We do not know the effects of pre-medication with midazolam on the incidence of emergence delirium. We will assume a standard deviation of 4, a value consistent with the current published literature. By enrolling 100 subjects we can detect a difference of scores of at least 2.5 points. This enrollment will give us 80 power with an alpha of 0.05. Since the distribution of scores wont be normal, this enrollment target also includes a 15 increase to allow for a non-parametric distribution of results. Group A and group S will each have 50 children. 