The North York Sleep & Diagnostic Centre is a state-of-the-art sleep laboratory located within the Polyclinic.  On our medical team are some of the world’s most renowned sleep medicine experts, including Dr. Victor Hoffstein, Dr. Adam Moscovitch, Dr. Kevin Lumb and Dr. Avishay Perl.

Our facilities are fully equipped for patients’ convenience, featuring private individual sleep rooms with soundproof walls, luxurious double-sized beds and a common TV & waiting area. Our specialists are available for consultations to cover almost every sleep-related perspective, including Neurology, Psychiatry, Respirology and ENT (Ear, Nose & Throat) Specialties.

Reminder list:

  • Must bring a VALID HEALTH CARD and a list ofALL MEDICATIONS currently taking.
  • Must bring a translator if the patient cannot speak English.
  • Patients who wish to RESCHEDULE or CANCEL their appointments must do so at least 48 business hours in advance to avoid a cancellation fee of $150.

To access our services, a referral form completed by attending physician can be faxed to:416-642-4234 or emailed to: Patients will be contacted directly within two business days. Appointment details & specific instructions will be provided at the time of booking.

Our Medical Team

  • Dr. Victor Hoffstein
  • Dr. Kevin Lumb
  • Dr. Adam Moscovitch
  • Dr. Avishay Perl
Tel: 416-642-4232
Fax: 416-642-4234
General Inquiries Email:


Monday: 8 a.m. – 7 p.m.
Tuesday: 8 a.m. – 4 p.m.
Wednesday: 8 a.m. – 7 p.m.
Thursday: 8 a.m. – 5 p.m.
Friday: 8 a.m. – 5 p.m.


North York Sleep & Diagnostic Centre is closed on weekends and all statutory holidays. Operating hours are subject to change without notice.

The North York Sleep & Diagnostic Centre offers the following services. Click on a tab to learn more:

Sleep Consultation

As part of our complete patient care plan, patients referred to North York Sleep & Diagnostic Centre are generally seen in consultation with one of our sleep specialists either before or after their sleep study, or both. This allows patient’s questions and concerns to be addressed with an expert in the field of sleep medicine. For your convenience, we currently offer consultations with physicians who are also qualified respirology, psychiatry and neurology specialists in addition to their sleep specialist qualifications.

(2) Overnight Diagnostic Sleep Studies

The nocturnal polysomnogram, usually called sleep study, is a diagnostic sleep test performed in the sleep laboratory. It is most commonly used for an objective diagnosis of patients suspected experiencing respiratory disturbances, snoring, difficulty initiating and/or maintaining sleep, excessive daytime sleepiness, abnormal sleep behavior such as sleep walking or sleep talking, morning headaches or dry mouth unexplained by other medical conditions, etc. Overnight polysomnographies are used to properly diagnose and assess patients with obstructive and central sleep apnea, restless legs syndrome, periodic leg movement disorders, insomnia, narcolepsy, upper airway resistance syndrome,circadian rhythm sleep disorders such as delayed sleep phase disorder and advanced sleep phase disorder, Cheyne-Stokes breathing and many others.

Patients referred by their physician spend a full night at the sleep laboratory where the testing is conducted by trained sleep technologists. Patients are attached to medical equipment which transmits electrophysiological signals from various regions of the body to computerized collecting stations which continuously record the signals throughout the night.

The test permits the interpreting physician to determine total sleep time, sleep efficiency, the relative percentages of NREM and REM sleep, sleep stage latencies, respiratory function versus body position, snoring, oxygen saturation, periodic limb movements, and arousal indices. These quantitative measures assist the interpreting physician in making a diagnosis of a sleep disorder.

If you are having this procedure, please make sure to read the information and instructions sheet with further details found here.

Therapeutic Sleep Studies

CPAP or BiPAP Titration

For some patients who have been diagnosed with sleep apnea, the effects of continuous positive airway pressure (CPAP) or bi-level positive airway pressure (BiPAP) are evaluated. Usually these are patients who have had a previous sleep study to diagnose the condition. As with overnight diagnostic sleep study, patients scheduled for a titration study spend a full night at the sleep laboratory. Patients are attached to the same medical equipment as used in the initial sleep study. The sensors used to measure airflow in the first study are replaced by a CPAP mask, which is fit around the nose or around nose and mouth, and delivers air at variable pressure settings.

The goal of CPAP is to increase a patient’s overall quality of sleep by reducing or eliminating sleep-disordered breathing, decreasing the number of arousals, stabilizing oxygen saturation, and eliminating snoring.During CPAP/BiPAP sleep study, we attempt to find a pressure level that holds the airway open and lets the patient get a good night sleep.

Other Therapeutic Studies

Therapeutic studies may otherwise be done to evaluate the response to various treatments of sleep apnea, including surgical procedures, use of oral appliance therapy, positional therapy and weight loss.

Daytime Sleep Studies

Maintenance of Wakefulness Test (MWT)

MWT tests the patient’s ability to remain awake during non-active situations throughout the day. The test is based on the idea that the ability to stay awake may be more important to know in some cases than how fast one falls asleep. This is the case when the MWT is used to see how well a patient with a sleep disorder is able to stay awake after starting treatment. It is also used to help judge whether a patient is too tired to drive or perform other daily tasks. For this test, patients will be asked to sit in a dimly lit room for four 40-minute intervals throughout the day. This is a non-invasive test that requires minimal electrodes.

If you are having this procedure please make sure to read the information sheet with further details found here.

Multiple Sleep Latency Test (MSLT)

MSLT procedure consists of two sleep studies: an overnight diagnostic study and a daytime study(MSLT). Patients should be prepared to stay at the clinic for duration of 20 hours in order to complete both tests. The Multiple Sleep Latency Test (MSLT) objectively evaluates a person’s level of daytime sleepiness. The MSLT includes a repeated measurement of sleep latency (how quickly a person can fall asleep) across the span of a day and is conducted in a dark, quiet setting with minimal extraneous stimuli which might otherwise influence the results of the MSLT. This is done via a series of “nap tests” performed at regular timed intervals throughout the day, usually four or five. There are a minimum of four naps, each ranging between 20 minutes to a maximum elapsed time of 35 minutes depending on the specific events which occur during each specific nap.

If you are having this procedure please make sure to read the information sheet with further details found here.