Comparing Two Doses of Oral Melatonin as Premedication in Children Undergoing Surgery

Patients will receive oral melatonin at a dose of 0.2 mg/kg as premedication in the morning of the surgery, 90 minutes before the induction of anesthesia, with a maximum dose of melatonin set at 10 mg.

Patients will receive oral melatonin at a dose of 0.4 mg/kg as premedication in the morning of the surgery, 90 minutes before the induction of anesthesia, with a maximum dose of melatonin set at 10 mg.

Patients will receive oral placebo as premedication in the morning of the surgery, 90 minutes before the induction of anesthesia, with a maximum dose of melatonin set at 10 mg.