Our Physicians

We work with leading physicians in the growing field of sleep medicine. As a network of independent diagnostic testing facilities (IDTF) we are independent of a physician office, hospital or healthcare system. Our purpose is to furnish diagnostic tests and not directly use test results to treat patients. This means that we work closely with referring physicians and have relationships with interpreting physicians across California.

Once the sleep study is completed and the data is scored, the report is sent to one of our independent sleep specialists for review and interpretation. A referring physician may select a specific physician to interpret her patient’s sleep study or may defer to one of our qualified, sleep-boarded physicians.

If you do not have a physician to refer you for a sleep study or would like a consultation with a sleep specialist, we can refer you to one of our physicians.

  • Shirisha Janumpally, M.D. – Medical Director


    • Neurology
    • Sleep Disorders

    Dr. Shirisha Janumpally, the Medical Director for Advanced Sleep Medicine Services, is board-certified in sleep medicine and neurology.  She is also a member of the American Academy of Sleep Medicine, American Academy of Neurology and American Medical Association. She has worked in both academic and community settings as a neurologist and sleep medicine specialist. Dr. …

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  • Deepti Chandran, M.D.

    Dr. Chandran received her medical degree from Wright State University in Dayton, Ohio. She completed her Internal Medicine residency at UCSF-Alameda County Medical Center. After this, she completed a fellowship in Sleep Medicine at Stanford Sleep Disorders Clinic, one of the most prestigious sleep programs in the country.  In addition to her board certification in …

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  • Sheila Manhas, M.D.


    • Sleep Medicine
    • Neurology

    Dr. Sheila Manhas received her medical degree from the Univeristy of Alberta, Edmonton, Alberta and completed her residency in neurology at the University of Manitoba, Winnepeg, Manitoba. Dr. Manhas was a Fellow of the Royal College of Physicians and Surgeons of Candata.  She is board certified in neurology and sleep medicine. …

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  • Young Ko, M.D., Lancaster

    Dr. Young Ko has been in private practice for over 30 years and is boarded in critical care, pulmonology and sleep medicine. He has served the communities of the Antelope Valley with up-to-date pulmonary knowledge and new procedures including a treatment for patients with severe persistent asthma called Bronchial Thermoplasty. Dr. Ko performs Endobronchial Ultrasound …

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  • Yurzul Dhanani, M.D., Hemet


    • Sleep Disorders
    • Pulmonary and Intensive Care

    Dr. Yurzul Dhanani is Board Certified in Internal Medicine, Pulmonary (Respiratory) Medicine and Critical Care Medicine. Dr. Dhanani specializes in the diagnosis and treatment of sleep disorders, in particular sleep apnea, and lung diseases. Dr Dhanani did his Internal Medicine Residency at Helene Fuld Medical Center in Trenton N.J. and completed his Chief Residency at …

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  • Karen D. Cheng, M.D, Laguna Hills


    • Neurology
    • Sleep Disorders

    Dr. Karen Cheng is board–certified in sleep medicine and neurology. She is an active member of the American Academy of Sleep Medicine, the American Academy of Neurology and the California Sleep Society. Dr.  Cheng is in private practice in Laguna Hills at the Saddleback Medical Tower and is a medical staff member of Saddleback Memorial Medical …

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