BDNF and insomnia measurement: Outcomes assessed included VAS (Visual Analog Scale), AIS (Athens Insomnia Scale), NRS (Numeric Rating Scale), QoR-15 (Postoperative Quality of Recovery), remifentanil consumption, ICFS-10 (Inpatient Cognitive Function Scale) scores, and plasma BDNF (brain-derived neurotrophic factor) concentrations.