Pharyngeal upper airway surgery in patients with obstructive sleep apnea (OSA) resulted in no significant, persistent adverse change in swallowing function.
No Significant Association Between Laryngopharyngeal Reflux and Obstructive Sleep Apnea
Age and smoking, but not body mass index, are associated with laryngopharyngeal reflux (LPR).

Is UPPP Effective in Obstructive Sleep Apnea?
There is level 1 evidence that suggests UPPP surgery is an effective treatment for OSA in the appropriately selected patient.