Toronto Thornhill

This service location offers clinical consultation and diagnostic polysomnography (overnight sleep lab testing).

Medical Director

Dr. Alan Ong

Toronto Sleep Institute

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

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."