This social story that I created is great to use with a student who gets tired and frustrated during class work. I would suggest reading it at the beginning of lessons to remind student that this is a better option than having an emotional episode or shut down. This would be good to use in addition to a positive behavior management system that includes scheduled breaks as rewards students are working for. I would suggest making sure that you are monitoring the time students are capable of working for and make changes to schedules and behavior systems according to data. Hopefully this helps someone!