(480) 830-3900


We are here to help you take control of your sleep health.

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

Step 1 |  Make an appointment for a sleep consultation to meet with one of our sleep providers.

Step 2 | Your sleep specialist will determine if a sleep study is necessary and prepare a plan for you.

Our Board Certified Sleep Specialists

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.

James Davis, D.O.

Consulting Physician – Mesa, Chandler, Arrowhead and Biltmore

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.


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

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.

Leonard M. Moss, M.D.

Medical Director – Scottsdale

Leonard M. Moss, MD has been a board certified sleep physician practicing in Arizona since 2006. He was the first in-clinic provider of sleep medicine consultations at Valley Sleep Center in 2007, starting practice then at the Biltmore Center. Dr. Moss’ education and training were at Washington University in St. Louis, University of Kansas School of Medicine, University of Nebraska Hospitals, and Creighton University Medical School in Omaha, NE. He practiced pulmonary and critical care medicine in Nebraska and Kansas from 1980 to 2006. Dr. Moss is a Fellow of the American College of Chest Physicians and the American Academy of Sleep Medicine. He is Board certified in Sleep Medicine with the American Board of Medical Specialties/ABIM through 2027.


Valley Sleep Center Providers

Adam Frose, Ph.D.

Behavior Sleep Health Provider 

Dr. Adam Frose completed his postgraduate training at the Spark M. Matsunaga VA Medical Center in Honolulu, Hawaii and trained previously at the Central Arkansas Veteran Healthcare System and Memphis VA Medical Center. He graduated from the University of Memphis with a Ph.D. in Counseling Psychology.

Dr. Frose is a member of the American Psychological Association, Arizona Psychological Association, Society of Behavioral Sleep Medicine, and Society of Health Psychology. He has a special interest in working with individuals that are impacted by sleep disorders and is credentialed by the Board of Registered Polysomnographic Technologists as a Clinical Sleep Health Educator. He uses a collaborative approach to work with patients in order to overcome and work through sleep troubles and the co-occurring issues that often come with sleep difficulties. In addition, Dr. Frose has interests in health psychology, positive psychology, mindfulness and health promotion. In his free time, he enjoys running, hiking, biking, swimming and watching movies and sports.


Malia Garcia


Malia Garcia is a board certified Family Nurse Practitioner, obtaining both her undergraduate and graduate degrees from Grand Canyon University. She has been working in healthcare for over 14 years, with her entire nursing career dedicated to Cardiovascular disease. She is passionate about healthcare and committed to serving those in need, knowing that for people to be well, they have to sleep well. When she is not catching her own Zzzz’s, Malia enjoys traveling and spending time with her family, friends, and dog.

Christina Miller


Christina grew up in Montana, then moved to Arizona for the warm weather. She attended Grand Canyon University as an undergraduate and went on to obtain her Family Practice Nurse Practitioner degree through University of Phoenix. Christina is the mother of three boys and has come to love soccer, hockey, and most outdoor events through them. Her free time is spent reading or enjoying a nice meal with husband. Sleep medicine became Christina’s passion through personal experiences – losing a loved one to sudden cardiac death, being the spouse of a snorer, and her own experience with fragmented sleep. Christina’s mission at Valley Sleep Center is to help people achieve better health through better sleep.

John Roesler


John Arthur Roesler is a Nurse Practitioner Specialist in Scottsdale, Arizona. He graduated with honors in 2018. He is licensed as a Physician Assistants & Advanced Practice Nursing Providers / Nurse Practitioner as well as in acute care and gerontology.

Margena Staten-Branch


Margena is an adult nurse practitioner. She earned her masters degree at the University of Alabama at Birmingham . She has a background in cardiology, chronic disease management and preventative care. She is passionate about sleep medicine because without the diagnosis and treatment of sleep issues many aspects of a persons health can be effected. She is married with five children. She enjoys reading, traveling and spending quality time with her family.

Kimberly Vana


Kimberly 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.

Lauri Leadley

CCSH, RPSGT, President- Clinical Sleep Educator

My fascination with the physiology of sleep began more than 30 years ago when I was a respiratory therapist and saw a patient with sleep apnea for the first time. It led me to become a sleep technologist. I remember my very first patient who woke up after a sleep study and said, “Wow, I’ve never dreamt before and l last night I had dreams!” It was a turning point in my career.
Our culture, in general, doesn’t recognize the human body’s need for adequate sleep. I was guilty of this for years. Chronic pain has interrupted my sleep and life for as long as I can remember and I continued to ignore it.
It wasn’t until my second cancer diagnosis that I found myself struggling to fall asleep and stay asleep and I knew that the lack of sleep was impacting my body’s ability to heal. I experienced first-hand the results of having a long-running pattern of sleep loss and its effect on my health.
My own health challenges over the years fed my desire to change lives. Now I’d like to help you overcome your battles.