What? How? For me it's like when someone says "Don't think of an elephant!". If I try to not think I'd only be thinking about not thinking. And then I'd be thinking about how I'm thinking about not thinking and then... until it's thinking about thinking all the way down.
My boyfriend can just 'turn his head off'. I don't get it. I have a constant stream of thoughts / music / whatever going on in my brain. Only once I got to experience what its like to 'not have a thought' and that's after taking medication to deal with a panic attack. The next 30 minutes after it was just quiet. It was a very bizzare experience.