Standard medical history questions will be asked during this visit along with questions that assess the likelihood of you falling asleep in various situations. Your medical records from your pulmonary doctor will be reviewed for information about the results of the sleep study you had that determined you have a sleep disorder. You will be asked to keep a diary everyday, for the first six weeks, of how many hours per night you use the treatment for your sleep disorder. This visit will last approximately 1-1 ½ hours.