I read on the internet somewhere of this technique called HIT. Which stands for hypnagogic imagery Technique. It's basically saying that you constantly switch your attention so that you are not thinking about anything for a few seconds. And after a while of doing this, you will start to see hypnagogic imagery. But what does it mean by Constantly switch your attention so that you dont think about anything. Because this is apparently what is happening right before you got to sleep, so how do you constantly switch attention?