Watched a very interesting program a while back on a set of schoolkids who were being monitored for a particular experiment. One kid went from climbing all over the couch, hanging upside down over the back of it, etc, etc while watching TV (from pure boredom) to spending 3 hours a day reading of his own accord, over the course of about 3 months.
The tablet they were given....... cod liver oil.
Apperently, it's all to do with the enzymes in CLO which allow the brain to remain focussed a lot better, and make it easier to create neural pathways for memory etc etc.
I 'tested' the theory when doing my PPL groundschool, 3 night a week for 4 weeks. In previous night classes (in IT) I would sometimes drift off, as far as dozing off briefly on occasion.
I was very surprised by my attention span at the PPL groundschool, interest in the subject matter notwithstanding(being greater than my interest in IT).