Sleep
Many years ago, I was lucky enough to spend a week in Finland looking at how their schools approached teaching. One thing that struck me was how quite a few classrooms had foldout beds on the walls. I asked when they would be used and got the rather obvious response that they were for using when a student was too tired to learn anything. Clearly, when a student is too tired to learn, there is an issue outside of the classroom that requires consideration, but in the moment, when their head sags and their eyes close, should we be keeping them awake or letting them get some rest?