What are thoughts, and how do we control them? If we can control thought stimulation in the cerebral cortex, the sleep centre will take over. In other words, if we can control thoughts, we will shift into the THS and sleep will follow soon.
Thoughts are like a big theatre stage. Thoughts are ideas, images, and conversations that are presented to the conscious mind. There may be a lot of thinking going on in the mind, but those thoughts that are conscious to us at one single moment are very limited. For example, right now you are reading this book, and your mind is conscious only of reading this sentence. You are less conscious of the last paragraph or of the last chapter. You are even less conscious of your surroundings, such as what clothes you are wearing, and, furthermore, you are even less conscious of the activities outside your room; unless your attention is drawn to them. At one single moment the mind is only conscious of a limited amount of information.
The mind is very much like a big stage in the theatre. There may be a lot of activities on the stage. The theatre is normally dark, and you can hardly read the programme, but the stage is bright and you can see and be aware of what is on the stage. This is like the fully awake state of your mind. You are aware of most of the events on the stage and you can be very easily distracted from one part of the stage to the other.
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