Dr. Lim is a sleep neurologist at Sunnybrook Health Sciences Centre and associate professor of neurology at the University of Toronto.  He completed his MD and neurology residency at the University of Toronto followed by a fellowship in sleep medicine at Harvard Medical School.  He is PI of the Ontario Sleep Health Study, and co-PI of the Canadian Consortium on Neurodegeneration in Aging Sleep Team.

His research focuses on understanding the bi-directional links between sleep and circadian disruption and neurodegenerative disorders, and his clinical practice focuses on older adults with and without neurodegenerative diseases who are experiencing sleep and circadian rhythm disturbances.