My wife has AS. When she's in meltdown mode one of the things she does is hit herself hard with the heel of her hand to her forehead. This is not every day, and has never left bruises, but she's worried if there might be lasting effects for this.
It's scary for me to watch, but what I figure is happening is she's having a meltdown, therefore is experiencing extreme stress and anxiety, and hitting herself produces a rush of endorphins that make her feel less anxious, out of control, and angry, and help clear her mind a bit. If that's the case, I'm hesitant to see it as a problem, unless there's a risk of long-term damage. Otherwise, it's a lot less destructive than other self- (and prescription, honestly) medications for handling the extreme emotional distress she suffers.
What do you guys think? I browsed through a couple old threads and it seems like this is pretty common.