Here's the NPR story on that research: http://www.npr.org/blogs/health/2013/10/18/236211811/brains-sweep-themselves-clean-of-toxins-during-sleep http://www.npr.

Here's the NPR story on that research: http://www.npr.org/blogs/health/2013/10/18/236211811/brains-sweep-themselves-clean-of-toxins-during-sleep http://www.npr.org/blogs/health/2013/10/18/236211811/brains-...