Funny that you mention that. A month ago I started the Duolingo chess course, and just yesterday I noticed that my brain is clearer, more capable of deep though

Funny that you mention that. A month ago I started the Duolingo chess course, and just yesterday I noticed that my brain is clearer, more capable of deep thought than it has been in years. It's like stepping out of a fog. I also started CPAP recently, so it's hard to attribute the change to either, but I feel certain that the chess helped.