This is a drawing I did of my Dad several years ago. He had just taken a shower and was reading a book on the bed.
When my Dad stopped drinking for good I asked him if he noticed any difference in his life. He thought about it for a while and said that when he read a book before going to bed, he would wake up the next morning with no memory of what he had read and would end up re-reading the same pages night after night. After he stopped drinking he could remember what he had read and got through books much faster. That was the only difference he could think of.
My mother snorted.