Check out these questionnaires to see if it might be a good idea to inquire with your physician about the possibility of having Obstructive Sleep Apnea (OSA). OSA results in a lack of oxygen circulating through our bodies due to a compromised airway. This affects us physically (blood pressure, stroke, heart), mentally (memory and concentration problems) and emotionally (irritability, depression). 90% of patients are undiagnosed, and an estimated 20% of the US adult population is estimated to have OSA.