Nearly 405 patients who underwent an ear, nose and throat surgeon functional endoscopic sinus surgery for medically refractory symptoms. Sixty people also had obstructive sleep apnea. Ensuing surgery, patients with and without obstructive sleep apnea improved on several measures, including quality of life and disease severity. Patients without obstructive sleep apnea reported greater improvements on sleep quality. The link between obstructive sleep apnea and chronic sinus problems is unclear, but might include changes in how air flows through the nose and airways, or how sleep affects the body's ability to manage infection.