ADHD often improved by tonsillectomy. Sleep apnea can definitely damage your concentration. Thanks, corvideye.

I'm doing some research on demonstrably effective methods for improving working memory, to help one of my students, and I found this article.

Highly relevant excerpt:

People with ADHD tend to have difficulty with working-memory capacity, and that deficit could be responsible for their tendency to be distracted and resulting problems at school, ( Read more... )