Sleep is a critical function that can be disrupted by substance use. In fact, the majority of people with an alcohol use disorder report insomnia or sleep disturbance. So, what is good sleep, and why does it seem that substance use disrupts it? Can you treat the sleep, even if the drinking doesn't change? Does cannabis actually help sleep? Dr. Mary Beth Miller answers these questions and more, in our latest episode on the relationship between sleep and substance use. Dr. Mary Beth Miller is an Assistant Professor in the Department of Psychiatry at the University of Missouri School of Medicine.