 In both groups, dexmedetomidine or saline will be stopped approximately 15-20 minutes before completion of surgery, diclofenac sodium 1 mgkg will be given IM at the time of skin closure. Desflurane will be discontinued after skin closure in both groups. Reversal of neuromuscular blockade will be achieved with neostigmine 0.05 mgkg and atropine 0.02 mgkg. Tracheal extubation will be done when respiration is satisfactory and adequate muscle tone is achieved 