Sleep apnea and asthma are two commonly diagnosed respiratory illnesses. Even though there is much research on them, there is still more to be learned. Think of some of the problems you have experienced with patients. Which ones interested you most? Why? Explain to the interviewer that you are interested in understanding how these illnesses affect the oxygen supplied to the brain, which ultimately affects the patient's overall health. Are you interested in finding out if some of these common illnesses can be prevented or treated in a more effective way?