Effect of Sedative and Anxiolytic Premedication on Children Experience After General Anesthesia

Inclusion Criteria: * Subject over 7 and under 18 years of age * Subjects who are scheduled for surgery * Subject who will be under general anesthesia * Subject able to complete a self-questionnaire in French Exclusion Criteria: * Subject who has already participated in the pediaPREM study * Subject with a treated anxiety disorder * Subject with cognitive disorders * Subject suffering from chronic pain (outside the operated area) * Subject with ADD (Attention Deficit Disorder) with or without hyperactivity, with or without treatment * Subject suffering from mental retardation * Subjects receiving psychotropic treatment * Subject whose intervention could reduce the ability to complete a self-questionnaire (neurosurgery etc.) * Subject with a contra-indication to midazolam and its excipients * Subject with a contra-indication to dexmedetomidine and its excipients * Subjects who need to receive intravenous alpha agonist in perioperative * Subjects requiring emergency intervention * Subjects requiring preoperative hypnosis * Subject who needs general anesthesia for diagnostic purposes (biopsy, etc...) * Subject having had a surgical intervention in the month preceding the inclusion. * Subject who will have an iterative surgical intervention within 15 days (removal of material, burns etc...) * Subjects who are scheduled for surgery as part of oncology management * Pregnant or breastfeeding woman * Subject whose two parents have not signed a written informed consent * Subjects who are not affiliated with or benefiting from a social security plan