I don't sleep well at night. I never have. But, after lunch (and after perusing HN for a few minutes), I start feeling that dull sensation like my brain is tryi

I don't sleep well at night. I never have. But, after lunch (and after perusing HN for a few minutes), I start feeling that dull sensation like my brain is trying to shut down. If, at that point, I get into a reasonably comfortable position (doesn't have to be lying down, just rest your head on a table or lean back in a chair with head supported), close my eyes and allow my thoughts to wander. In 5 to 15 minutes the world looks like a much better place. I really think the key is closing your eyes. I've read (no citation available) that the vision system requires a huge amount of brain activity and that by shutting your eyes you can achieve a large sleep like win even if you don't sleep.