About Us

Meet the Sleep Experts

Together our staff has over 10 years experience in the diagnosis and management of sleep disorders in pediatric, adult and geriatric populations.

About Our Practice

At Sleep Medicine Specialists of California, we offer sleep solutions equipped for the modern world with access to cutting edge diagnostic tests, turn-key interpretations, easy access telemedicine visits, and a complete array of treatment options catered to the needs of each individual patient so you can Live Better and Sleep Better. Forever.

Knowledgeable, caring, compassionate, the list goes on. Dr. Singh is heaven-sent. I have seen many specialists over the past 25 plus years and have been misdiagnosed for about the same length of time. My first visit with Dr. Singh, based off of my symptoms and really listening to me, he was already confident that he knew what was wrong with me. He ordered a test that was never recommended in the past by any of the other doctors, to confirm. Results are in and he hit the nail on the head! I am now looking forward to the treatment that is going to get me up and running again!

Dorie B. | July, 2019


Our Board Certified Doctors

With Over 10 Years of Experience, We Have Helped Thousands of Patients

I personally find nothing more rewarding than improving my patient's quality of life after treating their sleep disorders properly.

Excellent quality sleep is the secret to wellness.

Meet The Sleep experts

Accredited Doctor with Over 10 Years of Experience

Excellent quality sleep is the secret to wellness.

Haramandeep Singh, MD

Board Certified in Sleep Medicine & Psychiatry & CEO of SMSC

Dr. Singh is a board certified Sleep Medicine specialist. He earned his medical degree from Washington University School of Medicine in St Louis, Missouri. He completed an internship in Internal Medicine at the University of Chicago, Illinois and a residency in Psychiatry at Johns Hopkins Hospital in Baltimore, Maryland.  While practicing psychiatry for 8 years, he developed a keen interest in neuropsychiatric and cardiovascular consequences of untreated sleep disorders which led to completing a fellowship in Sleep Medicine at the University of Texas Southwestern in Dallas, Texas in 2006-2007 where he was the Chief Fellow and published a review paper on use of doxepin in the treatment of insomnia.

In 2008, he brought his expertise to the Tri-Valley area of Northern California as CEO of Sleep Medicine Specialists of California and continues to serve as Medical Director of the Tri-Valley Sleep Center in San Ramon. He is well qualified and has extensive experience in the evaluation and successful treatment of the entire gamut of sleep disorders in the pediatric and adult population such as sleep disordered breathing, insomnia, narcolepsy, restless legs syndrome, etc.

Considered an expert and key opinion leader in the diagnosis and management of narcolepsy, he has a large narcolepsy patient population throughout the country.  He is the Principal Investigator for 3 ongoing clinical trials and had the largest site on the west coast for the Pitolisant Early Access Clinical Evaluation (PEACE) trial. 

He is a member of the American Academy of Sleep Medicine and the California Sleep Society. Dr Singh is also a diplomate of the American Board of Psychiatry and Neurology.

Dr. Grewal picture for website

I personally find nothing more rewarding than improving my patient's quality of life after treating their sleep disorders properly.

Navjot Grewal, DO

Board Certified in Sleep Medicine & Internal Medicine

Dr. Grewal is board certified in Sleep Medicine and Internal Medicine.  While he was an undergraduate, he pursued both Industrial & Manufacturing Engineering as well as his Pre-Medical studies during his time at Pennsylvania State University. Upon graduation, Dr. Grewal had the privilege of working with the Armed Services (Army, Air Force, Marines, Navy as well as Marine Sealift Command) as well as the Transportation Security Agency (TSA) while being employed with International Business Machines (IBM).

Following his career with IBM, he attended medical school at the Edward Via Virginia College of Osteopathic Medicine.  He completed his Internal Medicine Residency at Cooper University Hospital and also had the privilege of being a Chief Medical Resident.

He worked several years as an Internal Medicine Physician where he developed an interest in Sleep Medicine and its impact on Cardiovascular, Pulmonary, Neurological and Gastroenterological systems.  He finished his Sleep Medicine Fellowship at Hackensack Meridian Health, JFK Medical Center.  His research includes “Sleep Conservation Protocol in the ICU” as well as an American Academy of Sleep Medicine Poster Presentation and research report: “To be, or not to be RBD? Case series of patients with discrepancy between clinical vs. PSG criteria for diagnosis of REM Behavior Disorder (RBD).” He is highly qualified and experienced in the evaluation and treatment of the various sleep disorders in the pediatric and adult population. 

He is married with two children.  During his time off he enjoys recreational activities such as basketball, volleyball, football, playing board games and enjoying time with family and friends, especially his young children.

Our Friendly & Warm Staff



Practice Administrator /
Billing Manager

Tamra has been with our office since 2011. She brings an extensive knowledge of insurance to our team. Her reliable follow through will leave you at ease and you can rest assured your billing inquiries will be responded to promptly.

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Lead Front Office Administrator

Janelle has been with our office since 2020. She is the bright face you’ll see when you enter our office. Whether you’re calling, emailing, or texting our office, Janelle will ensure that your questions are answered.

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Medical Assistant

Jordan has been with our office since 2023. She is the main back office medical assistant who is involved in checking you in for your appointments, making sure orders are sent out appropriately on your behalf, tackling day to day issues as well as performing various other duties to make sure her patients are treated with the best of care.



Sleep Study Coordinator

Shay has been with our office since 2019. She is an integral part of our practice, whether you are scheduling an in lab study or a home sleep study you are in good hands. Shay will be your point of contact and ensure that all your questions are answered in a timely fashion.