Much of the corrective work all Neuro-Linguistic Programming (NLP) involves the technique of self-hypnosis, ie making changes on yourself while in a trance. A hypnotized patient doesn’t actually go to sleep, but is in a state of trance, which can be from light to deep. Trance is actually a heightened state of awareness when the the patient is more suggestible and, therefore, more open to change work on a mental level

Read more from the original source: 
NLP – An Introduction to Self-Hypnosis and Trance Work