All through my school life I was appalled by the fact that masters and senior boys were allowed quite literally to wound other boys, and sometimes very severely.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
If you can't sleep, then get up and do something instead of lying there worrying. It's the worry that gets you, not the lack of sleep.