Hypnosis is quite a tricky thing.
First, not knowing how you got home is not hypnosis. It is schizophrenia :P OK, kidding, but it is just you were too deeply thinking of something, and automatically did the rather known action of driving yourself home. Would you not remember the details if you had an accident? Wouldn't this be the case if you were hypnotized?
Medical purposes are quite limited. Many scammers are offering it widely as a solution to anything: from curing physical and mental illness to penis enlargement (yes, really!).
And one of the most popular application of hypnosis (from movies at least)... remembering your past (or even past lives!). Did you know that the brain is capable of 'inventing' memories? I.e. you didn't lived the thing you remember?
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