I'm new to your program, but very fascinated with neuroplasticity! You spoke about the importance of sleep. Have you ever done a lecture on sleep apnea--specifically in relationship to ADHD? I'm 62 years old and have never been on a stimulant for my ADHD. My inability to focus appears to be getting worse, but my brain is also changing as I age. I don't want to go on a medication, but I'm finding it difficult to function on a day-to-day basis. I'd appreciate any help you can give to navigate this very difficult time. Thank you for devoting your life to helping people understand neuroscience. (Nona:)