Effect of perioperative dexmedetomidine on postoperative sleep quality and rehabilitation of patients undergoing laparoscopic radical gastrectomy for gastric cancer and colorectal cancer

Interventions: Group C:Normal saline was used during operation and sufentanil was used in PCIA after operation;Group D1:Dexmedetomidine was used during operation and sufentanil was used in PCIA after operation;Group D2:Dexmedetomidine was used during operation, and sufentanil combined with dexmedetomidine was used in PCIA after operation
Primary outcome(s): The sleep quality of patients;Night Sleep;The first occurrence time of bowel sounds;Intraperative drug consumption and hemodynamics;The delirium score of patients;Postoperative pain score and PCIA compression times;adverse reaction
Study Design: Parallel