After getting the approval of the local committee of ethics in Bushehr University of Medical Sciences, 300 patients ASA 1 and 2 age between 15 and 45 years old who are candidates for caesarean section and signed informed consent, were randomly allocated into three groups. One control group and 2 intervention groups. Group 1 received placebo after delivery of fetus, group 2 received midazolam 02% mg/kg after delivery of fetus and group 3 received 0.1 mg/kg sufentanyl. Shivering, hemodynamic change, nausea and vomiting will be recorded and compared among the study groups. The monitoring in the four group were the same (NIBPM, Pulse oximetry, HR in minute 1, 3, 10, 20, 30, 45 and in recovery room. Shivering were classified as CROOSLY described