Many people with AS try very hard to act "typical" in school, at work, and in other public places. It takes a great deal of effort and can be exhausting. As Tony Attwood put it, children with AS must learn the academic AND the social curricula when they are school, whereas NT children generally only have to concentrate on learning the adademic stuff. Spending 8+ hours a day trying to be someone you are not must be extremely frustrating and exhausting.
For this reason, many children and adults with AS need to have a chance to just "be themselves" when they get home: stim, focus on a special interest, be alone, whatever. My personal opinion is that it is usually a huge mistake to deny them that.