patients will receive intranasal dexmedetomidine (1 microgram/kg) -Intranasal dexmedetomidine will be prepared from the 100 mcg/ml parenteral preparation in a 1-ml syringe, and 0.9% saline will be added to make a final volume of 1 ml- (0.5 ml will be administrated in each nostril) before starting the anesthesia with monitoring of sedation level and oxygen saturation.

patients will receive intranasal midazolam (0.2 mg/kg) up to 5 mg - Intranasal midazolam will be prepared from a 5 mg/ml parenteral preparation, and 0.9% saline will be added to make a final volume of one ml in a 1-ml syringe- (0.5 ml will be administrated in each nostril) before starting the anesthesia with monitoring of sedation level and oxygen saturation.

Intranasal Dexmedetomidine

Parental separation anxiety scale (PSAS) ,A score of 1-2 was considered "satisfactory separation" and a score of 3-4 was considered "unsatisfactory separation."

Onset of sedation will be recorded according to Modified RAMSAY Sedation Scale when the score reaches 3 points, patient is then ready to be transferred.