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Basically, you are just in a state where your subconscious is open to suggestions...
There is very little evidence for any distinct physiological or cognitive condition of "hypnosis." The hypothesis was developed long before basic physiological research had established a "relaxation response," a genuine and universal phenomenon that is neither full wakefulness nor sleep.
Similarly, it is vague and wooly what "your subconscious" refers to. It is obvious that much goes on in our minds without conscious perception or control. For example, we do not experience what happens when we remember a telephone number. It is either "somehow" there for us, or we are distressed at its absence. That there is any sort of cohesion to all of the many, many things that happen in our heads without our being aware of their mechanics is speculative at best.
That is not to deny Tiggs' observation
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Failure to do so [properly research and otherwise proceed cautiously] will potentially result in you causing more harm to yourself than good.
The same can be said of Ouija boards. While the reality in both the Ouija and self-hypnotic cases is that you are talking to yourself, if you layer in a fantasy that you are not just talking to yourself, but rather "opening" (funny how the same verb,
to open, comes up in both contexts) yourself to "influences," then that is dangerous. But the danger is of the same kind as the danger inherent in acting out any fantasy or false appreciation of the situation in real life.
The bottom line is that you are always "open to suggestion." You can talk yourself into things, and others can talk you into things.
Tiggs is right: words do have power - always and under all physiological and psychological circumstances.
Othello is a great cautionary tale. Nobody is half-asleep or "opening themselves" in that play, but horrible things happen anyway, and the mechanism for the tragedy is "just words."