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About Us

About the Medical Clinic


Arizona Sleep Center provides a comprehensive care for all  ages. We specialize in the clinical assessment, diagnosis, management and prevention of sleep and circadian rhythm disorders. Sleep specialists treat patients of any age and use multidisciplinary approaches. Disorders managed by sleep specialists include, but are not limited to, restless legs syndrome, sleep related breathing disorders, insomnia, hypersomnias, circadian rhythm sleep disorders, parasomnias and sleep related movement disorders.


We offer home sleep tests to our patients suffering from sleep apnea. We can send you home with all of the equipment that you need to screen for sleep apnea from the comfort of your own bed! We use state of the art home sleep test equipment such as Watchpat, Phillips and Watermark.

Arizona Sleep Center has an on-site sleep lab to conduct studies called Polysomnography (PSG) to identify sleep disorders in a controlled environment.

There is an in house ACCREDITED Durable Medical Equipment (DME) supplier that can provide various sleep therapy products. Accreditation means we maintain high levels of excellence in service and supplies as defined by the Centers for Medicare & Medicaid Services, part of the Department of Health and Human Services.


Our DME is unique because we have in house Respiratory Therapist and Registered Polysomnographic Technologist who work directly with our providers. They are available to work one-on-one with patients to find the right equipment for compliance and best outcomes.

We offer state of the art CPAP (Continuous Positive Airway Pressure) and BiPAP (Bilevel Positive Airway Pressure) machines, masks, and supplies for treatments of sleep disordered breathing. We work with all the vendors providing sleep therapy solutions to help provide a variety of supplies to ensure comfort for each of our clients.

Providing you the best care

Aynur Okcay, M.D.

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Dr Aynur Okcay completed a comprehensive Sleep Medicine Fellowship program at Mayo Clinic in Rochester, MN.

The Center for Sleep Medicine at Mayo Clinic's campus in Minnesota is one of the largest sleep medicine facilities in the United States. The center is accredited by the American Academy of Sleep Medicine.


She has extensive research background at Mayo Clinic focusing on cardiovascular aspect of sleep disordered breathing. 


Dr Okcay has published several papers and a book chapter and gave presentations in both USA and international Sleep Medicine Conferences.

Having a Primary Care background, Dr Okcay realizes an inseparable relationship between healthy sleep and overall well-being. 


Dr Okcay listens closely to her patients to create a unique plan that will fit the individual patient's lifestyle and improve the quality of their sleep.

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Hannah Guinn, PA-C

Hannah Guinn, PA-C is a board-certified physician assistant, serving as a PA at Arizona Sleep Center. She has experience in sleep medicine from working with psychiatry, neurology, and sleep offices as a Neuroscience Specialty Representative. Hannah managed her own business and assisted many healthcare providers in optimizing patients’ sleep. Hannah has also worked with ENT surgeons in evaluating patients for sleep disorders and assisting in sleep apnea related surgeries.


During her studies, she learned ways to treat common sleep concerns by balancing allopathic and functional medicine. Hannah focuses on addressing the root cause of health problems and the importance of treating the patient as a whole person.


Born and raised in Las Vegas, Hannah completed her undergraduate biology degree and business minor at University of Nevada Las Vegas. Continuing her career in medicine, Hannah received her master’s degree in physician assistant studies at Touro University Nevada. While continuing her studies, she spoke at many community events, volunteered at local nonprofits to provide free medical care to the medically underserved communities of Nevada, advocated for state legislation, conducted research in various areas of medicine, published literature, and led student organizations.


Hannah holds accomplishments in her licensure from the Arizona Regulatory Board of Physician Assistants, the Nevada State Board of Medical Examiners, the Nevada State Board of Osteopathic Medicine, and certification from the National Commission on Certification of Physician Assistants. She has gained excellent knowledge working under Aynur Okcay, MD at Arizona Sleep Center.


Greg Nelson, R.R.T.

Gregory Nelson is a Registered Respiratory Therapist specializing in CPAP and BiPAP. Gregory excels at providing his patients with the one-on-one care that enables them to be successful with their sleep therapy. Gregory also serves on the Board of Advisors for Pima Medical Institute. He has also hosted several classes for hospice nurses, teaching them about basic respiratory care relating to oxygen, and CPAP/BIPAP which has aided them with their continued education and patient care techniques.

Gregory’s passion for patient care is what drives him to providing the most knowledgeable and personable one-on-one care. He strives to provide the best care possible at Arizona Sleep Center for many more years to come.

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