Toronto Thornhill

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This location offers clinical consultation, polysomnography (sleep lab testing) and cognitive behavioral therapy for insomnia.

Medical Director

Dr. Alan Ong

Dr. Ong obtained his Doctor of Medicine from the Faculty of Medicine at the University of Toronto and subsequently completed specialty training in Neurology and Sleep Medicine at the University of Toronto.

He is a Diplomate of the American Board of Sleep Medicine and a Fellow of the American Academy of Sleep Medicine. Dr. Ong has been a consultant sleep specialist at MedSleep/Toronto Sleep Institute Eglinton and Thornhill since our founding in 2004. He is also a consultant sleep specialist at the Sleep & Alertness Clinic and the York Region Sleep Disorders Centre. He served as the Medical Director of the Sleep & Alertness Clinic, Toronto Western Hospital, University Health Network (2006-2016) and is on the advisory board of the York Region Sleep Disorders Centre (2002-present).

Dr. Ong is active clinically managing a wide spectrum of sleep disorders. His areas of interest include nocturnal seizures, parasomnia, restless legs syndrome, narcolepsy, sleep apnea and its effects on the brain.

Toronto Sleep Institute

390 Steeles Avenue West, Suite 208
Thornhill, Ontario
L4J 6X2

Email: [email protected]
Office phone: 905-709-9696
Office fax: 905-709-9764


We are located between Bathurst and Yonge on the north side of Steeles in the Ronda plaza.

From the North
Hwy 404 South, exit on Steeles East. We are two traffic lights past Yonge Street at 390 Steeles Ave West (on your right hand side in the Rondo Plaza).

From the South
Hwy 401 to Allen Road North. Allen Road becomed Dufferin Street. Keep going straight on Dufferin past Finch. Make a Right on Steeles and end at 390 Steeles Ave W, two traffic lights after Bathurst on your left hand side in the Rondo Plaza.

From the East
Hwy 401 West to Don Valley Parkway/Hwy 404 exit. Take the 404 North, and exit on Woodbine Ave/Steeles Ave. Turn Left on Steeles Ave East. We are two traffice lights past Yonge Street (on your right hand side in the Rondo Plaza).

From the West
Hwy 401 East to Hwy 400. Take Hwy 400 North and exit on Steeles West ending at 390 Steeles Ave West, two traffic lights after Bathurst on the left side in the Rondo Plaza.

Public Transit
York Region/VIVA Transit: Please visit the trip planner website which will give you the perfect route to get to us.

TTC: Please visit the TTC website for routes, maps and schedules. You can also call TTC at 416-393-INFO (4636).

"Dr. Kohn saw me in a timely manner for both my consult and follow up appointments. I was well informed about the process before sleep test and diagnosis in terms I could understand."