My wife is bipolar 1, and whenever she would go into a manic phase, I noticed her attention span would diminish as her condition worsened. First she couldn't tolerate a whole movie. Then not a 40 minute TV show, then not even a 20 minute show. She would go through a music video phase where she would watch those on repeat for hours, but eventually even those become too long, so the last stop was YouTube shorts when her mental health was at its worse. I always knew she was getting better when she started watching longer-form content.