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Our Providers


At Valley Sleep Center, we are the sleep experts and we are here to help you take control of your sleep health. Most insurance companies do not require a referral to meet with one of our Board Certified Sleep Physicians and providers.

If you are having sleeping problems, the first step would be to make an appointment for a sleep consultation to meet with one of our sleep physicians. At that time they will determine if a sleep study is necessary.

Click here to schedule an appointment or call 480-830-3900.

Wahaj Ahmed, M.D.

Medical Director, Mesa, Chandler

Dr. Ahmed is board certified in internal medicine, pulmonary disease, critical care medicine and sleep medicine. His practice encompasses all aspects of diagnosis and treatment of pulmonary and sleep disorders.

Maria Martinez, M.D.

Medical Director, Arrowhead

Dr. Maria Martinez is a pediatric pulmonologist in Phoenix, Arizona. She received her medical degree from Universidad de Navarra Faculty of Medicine and has been in practice for 31 years.

Michael Mohan, M.D.

Medical Director, Biltmore, Scottsdale

Dr. Mohan is a graduate of Yale University and Harvard Medical School. He went on to complete postgraduate medical training at Massachusetts General Hospital, Beth Israel Deaconess Medical Center, and Boston Children’s Hospital, some of the top-ranked hospitals in the world. He is one of the only physicians in Arizona to have received dedicated Fellowship training in Sleep Medicine, having completed Harvard’s Sleep Medicine Fellowship Training Program in 2016. He has authored journal articles, textbook chapters, and teaching materials on the subject of sleep disorders. Dr. Mohan is board certified in sleep medicine and a member of the American Academy of Sleep Medicine.

James Davis, M.D.

Consulting Physician, Mesa, Chandler

Dr. James Davis completed his Internal Medicine training at Presence Saint Joseph Hospital in Chicago, Illinois. He completed a Pulmonary Medicine Fellowship at Rosalind Franklin University of Medicine and Science in North Chicago, Illinois. He also completed a Sleep Medicine Fellowship at Hennepin County Center in Minneapolis, Minnesota. Dr. Davis is a member of the American Thoracic Society, American College of Chest Physicians, and American Academy of Sleep Medicine. He is triple board certified in Internal Medicine, Pulmonary Medicine, and Sleep Medicine. In addition to managing various pulmonary disorders, Dr. Davis has a special interest in Sleep Medicine. He treats a variety of sleep disorders, including complex sleep-disordered breathing, insomnia, hypersomnia, restless leg syndrome, in both the adult and pediatric patient populations. He also has a particular interest in sleep and its effects on athletic performance. In his free time, he enjoys being active: doing strength and cardiovascular training, hiking, snowboard/skiing, dining out at restaurants, going to the movies, and traveling. He also enjoys spending time with his family and friends.

Kimberly Vana


Kimberly Vana, DNP, RN, FNP-BC, FNP-C is a sleep health nurse practitioner who actively is involved with national and local sleep organizations. She also has published several sleep research articles. Currently, she is a Clinical Professor at a college of nursing in the Phoenix, Arizona area.

Nicholas Failla


Nicholas Failla, MSN, RN, AGACNP-BC, is a board certified Adult-Gerontology Acute Care Nurse Practitioner. He has a wide-range of experience as a healthcare professional, including cardiovascular and pulmonary care.

Margena Y. Staten-Branch


Margena Staten-Branch, MSN, NP-C is a sleep nurse practitioner. She has worked in chronic disease management and preventative care. She enjoys educating patients.

Samantha Esquivias


Samantha Esquivias, MBA, MSN, FNP-C, is a sleep nurse practitioner. She has worked inpatient and outpatient from pediatrics to adults. She is currently working on obtaining her Doctorate of Nursing specializing in psychiatry and mental health.

Eric Noll


Eric Noll, MSN, AGACNP-BC, is a board certified Adult-Gerontology Acute Care Nurse Practitioner and Graduate of Grand Canyon University. He has worked in the medical field for 17 years and has a wide range of experience, with a passion for cardiology and particular interest in sleep disorders and their impact on the heart. In his free time Eric enjoys fishing, wakeboarding, snowboarding and spending time with his wife and 3 year old son.

Breanne Wasson

Marketing Representative

Breanne joined Valley Sleep Center 4 years ago. As a Supervisor of our Scottsdale location and now a Marketing representative, she continues to exemplify her contribution as a valuable team member. She has worked directly with our Patients to assist them in coordinating their sleep care needs while working in our Clinic locations and understands what it takes to provide quality customer service. Breanne has taken her understanding of customer care and now works with our Provider community to facilitate and educate our Providers. She assists them in understanding how our Sleep Centers can help Patients with their sleep health problems. Breanne has demonstrated a commitment to quality care and team work in order to provide excellence in Patient care.

Helen Baubie

Respitory Therapist

I am a native of Arizona, married and have one son. I have been a Respiratory Therapist since 1994. I have worked with sleep patience since 2003. The reason I love to work with patients that have obstructive sleep apnea is because I feel it is rewarding to me because I get to see them when they are sleep deprived and I can have them as patients for years. I get to see the progression of their lives changing from being treated. I think my best quality is I really listen to what my patients are saying. I feel that really helps me to help them and others that have the same issues. I learn new things everyday even though I have been in the field for years there is always something I learn.

Barbara LaSota

Sleep Tech

I have personally been involved with the success of CPAP for many years with my family. Since I can remember I had always wanted be a sleep tech. I had been going to school for a few years and it was time to decide what I wanted to do when I grew up. The PSG program was very enticing so I took the leap and here I am. Working graveyards with some of the most amazing people that call themselves "sleep techs".

Client Reviews

"I recommend them highly!! I took my 2 year old daughter for a sleep study and was very impressed. Our sleep technician was amazing with her, very patient and kind. The DVD we brought to watch while getting her hooked up got stuck in the TV and they vowed to return it. We got a call the next day checking on our daughter and saying how sweet she was, they mentioned the DVD. Several days later, we received the DVD plus a new copy of the Lion King with a nice note. They are very good at what they do and if they can make a 2 year old feel at ease, they can probably do the same with anyone!!"

Anthea S.

Tempe, AZ

"I was especially impressed with Andrew the Respiratory Therapist who reviewed my study with me and answered my questions. Andrew thoroughly explained everything about the Cpap machine-from start to finish. I never felt rushed and was assured I could contact him with any additional questions or needs. Andrew told me he would follow up with a call in a week and he did. I believe this center performed the study appropriately and the added benefit of having Andrew teach me about the machine and what to expect was a bonus."

Candace M.

Scottsdale, AZ

"Great staff, they make you feel so at home. Every medical facility should be this nice. Felt like a nice hotel. Someone has great taste in decorating. Thanks for making us feel at home."

Steve N.

San Diego, CA