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Millennium Physicians Respiratory & Sleep Disorder Specialists make up a team of 11 trained physicians in Pulmonary, Critical Care Medicine and Sleep Medicine. Our physicians have over 20 years of experience, diagnosing and treating a wide range of diseases and disorders of the respiratory tract. Whether you have sleep apnea, unexplained shortness of breath, a respiratory disease, or a rare genetic disorder, our team of trusted, experienced, board certified pulmonary specialists can help you and your family members improve your health and overall quality of life.


Millennium Physicians has two convenient sleep center locations with sleep medicine specialists that diagnose and treat patients with possible sleep-related disorders. We provide a wide range of advanced services using a compassionate, patient-centered approach, supported by the state-of-the-art technology and caring, knowledgeable staff.

Pulmonary Diseases and Disorders Treated

  • Asthma

  • Chronic Bronchitis

  • Chronic Obstructive Pulmonary Disease (COPD)

  • Emphysema

  • Lung Disease

  • Pneumonia

  • Pulmonary Fibrosis

  • Pulmonary Hypertension

  • Sarcoidosis

  • Sepsis

  • Shortness of Breath

  • Dyspnea

Sleep Disorders and Conditions Treated:

  • Hypersomnia

  • Insomnia and Fatigue

  • Narcolepsy

  • Excessive Daytime Sleepiness

  • Obstructive Sleep Apnea (OSA)

  • Parasomnias

  • Periodic Limb Movement Disorder (PLMB)

  • Restless Leg Syndrome (RLS)

  • Snoring

Pulmonary and Sleep Medicine Services

Pulmonary or Sleep Medicine Consultation

Our Pulmonologist will obtain your medical history, perform a focused physical exam, record your medications and allergies, review relevant laboratory and imaging results to determine the best possible treatment specifically designed for you.

Pulmonary Function Test (PFT)

This measures the amount of air you inhale and exhale and includes spirometry, which measures how fast you can release air out of your lungs to help diagnose breathing problems. PFT monitors the progression of pulmonary diseases with superior digital technology, all while offering comfort, accessibility, and flexible testing options for all patients.

Six Minute Walk Test (6MWT)

Measures the distance you can walk in 6 minutes while monitoring your lung performance as your heart rate increases during this exercise. The objective of the test is to walk as far as possible for 6 minutes. 

Sleep Study

A fully attended and supervised one or two night polysomnography (PSG) measures your sleep pattern from the changes in your heart rate and breathing.  Sleep studies are used to diagnose obstructive sleep apnea (OSA), narcolepsy or periodic limb movement disorder (PLMB).

Multiple Sleep Latency Test (MSLT)

Monitors brain waves, eye movements, muscle activity and EKG during five 20-minute nap periods scheduled throughout the day in two-hour intervals. MSLT measures how quickly you fall asleep during each nap (sleep latency). This tool is used to eliminate narcolepsy and hypersomnia.

Once your sleep study is completed and it is determined that you have sleep apnea, what are the next steps?

The good news is that most sleep disorders are easily treatable. Millennium Sleep Center offers patients with sleep apnea, access to Continuous Positive Airway Pressure (CPAP) devices that deliver air at a fixed pressure through the night to prevent airway obstruction. CPAP is the gold standard treatment for your sleep breathing disorder and is vital for you quality of life. CPAP therapy can prevent serious risks of obstructive sleep apnea such as myocardial infarction, diabetes, excessive urination at night, improve memory and cognitive functions, improve desired sleep, treat hypertension and control gastroesophageal reflux disease (GERD).  CPAP is considered the most effective treatment for obstructive sleep apnea (OSA).

Whether you are a new patient to CPAP therapy or looking to upgrade your device, our clinical sleep specialists are experts in not only selecting the equipment and fitting CPAP masks specifically for you, but also to help resolve issues you may encounter with your device.

Millennium Physicians Respiratory & Sleep Disorders Specialists are located at 5 convenient locations in North Houston, and two offices include our sleep center allowing physicians to evaluate and treat sleep disorders at one location.

Our Pulmonologists

Amrew Al-Ahmad, MD

Ariffin Alam, MD

Wael Asi, MD, FCCP, PA

Mohsin K. Bajwa, MD, FCCP

Salah Fares, MD

Jefy M. Mathew, MD, FCCP, D.ABSM

Amarbir S. Mattewal, MD

Hammad N. Qureshi, MD

William A. Rhoton, MD, FCCP

Humberto C. Sasieta, MD

Ather J. Siddiqi, MD, FCCP, FACP

Our Locations


Millennium Physicians – Respiratory & Sleep Disorders
506 Medical Center Blvd. Ste. 304
Conroe, TX 77304
P (281) 296-8788
F (281) 419-1291

North Houston 

Millennium Physicians – Respiratory & Sleep Disorders
1125 Cypress Station Dr. Ste. E
Houston, TX 77090
P (281) 537-6300
F (281) 719-5933


Millennium Sleep Center
18488 I-45 South
Shenandoah, TX 77384
P (281) 296-8788
F (281) 719-5936

The Woodlands

Millennium Physicians - Respiratory & Sleep Disorders
1111 Medical Plaza Dr. Ste. 250
The Woodlands, TX 77380-3477
P (281) 296-8788
F (281) 419-1291


Millennium Physicians - Respiratory & Sleep Disorders
13426 Medical Complex Dr. Ste. 175
Tomball, TX 77375
P (281) 296-8788
F (281) 419-1291

Vintage Park

Millennium Physicians - Respiratory & Sleep Disorders
20207 Chasewood Park Dr. Ste. 203

Houston, TX 77070
P (281) 537-6300
F (281) 537-7575