‘When the mind is in a state of uncertainty the smallest impulse directs it to either side.’ –Publius Terentius Afer
In my own experience, both as a subject of hypnosis and as a hypnotist, I’ve never seen a hint that hypnosis might be harmful. Contrary to popular understanding, the hypnotized subject is always aware of his situation in exactly the same way you are right now. The difference is that the subconscious shows up at the dance at the same time. Your conscious mind has the option of being somewhat of an observer, like a driver’s ed teacher, while your subconscious causes your arm to feel cold, or whatever the hypnotist suggests. But like a driver’s ed teacher, your conscious mind always has the option of intervening. A subject can snap out of it anytime he wants. Indeed, he is never asleep in any common sense of the word. It’s more of a relaxed state in which the subconscious is less dominated than usual by the conscious mind.
That’s the quick and dirty explanation of what’s happening. I think you could have a debate about whether there is really such a thing as a subconscious mind. It might be more accurate to say that a deeply relaxed mind functions differently than a non-relaxed mind, and in predictable ways, and leave it at that.
photo { Jeremy and Claire Weiss }