I owned a Sleep Center for 5 years and we employed PA's. You would not read/interpret data from Polysomnograms or be responsible to diagnose any sleep disorders. This could be achieved outside of being a doc but you would need a Phd in sleep and take the AASM sleep boards and I think know you must also fellow with a current sleep doc. You basically just take histories, write referrals to the sleep center and do follow ups. It's really not that glamours and very repetitive. Most Sleep PA's I know work it as a part time gig and typically work in pulmonary for a full time job. Many sleep centers do not have board certified sleep docs in the office, often when they do they don't see patients. I live in Alaska and my docs lived in ID and PA. They would read off a server and remotely and send the information back and the PA would deliver it to the patient or write the script for thearpy.