Braid can be taken to imply, in later writings, that hypnosis is largely a state of heightened suggestibility induced by expectation and focused attention. In particular, Hippolyte Bernheim became known as the leading proponent of the "suggestion theory" of hypnosis, at one point going so far as to declare that there is no hypnotic state, only heightened suggestibility. There is a general consensus that heightened suggestibility is an essential characteristic of hypnosis. In 1933, Clark L. Hull wrote:
Hypnosis (also known as "hypnotherapy") is often touted as a natural treatment for chronic sleep disorders, a problem estimated to affect millions of Americans each year. Although hypnosis has yet to be extensively studied in the treatment of insomnia and other sleep-related conditions, the existing research hints that hypnosis may be of some use in achieving sounder sleep.
“Each unhealthy current behavior, such as smoking, losing one’s temper, excessive alcohol consumption, or compulsive overeating has a chain of events that laid the foundation for all of our current unhealthy choices. Through the ‘memory chip’ that has been laid down in the subconscious mind, we can trace back the experiences and subconscious decisions we made as children that may be leading us to the behavior that is no longer healthy for us.”
Pioneers in this field, such as James Braid and James Esdaile discovered that hypnosis could be used to successfully anesthetize patients for surgeries. James Braid accidentally discovered that one of his patients began to enter a hypnotic state while staring at a fixed light as he waited for his eye examination to begin. Since mesmerism had fallen out of favor, Braid coined the term hypnotism, which is derived from the Greek word for sleep. Braid also used the techniques of monotony, rhythm, and imitation to assist in inducing a hypnotic state. As of 2000, these techniques are still in use.
Controversy surrounds the use of hypnotherapy to retrieve memories, especially those from early childhood or (supposed) past-lives. The American Medical Association and the American Psychological Association caution against recovered-memory therapy in cases of alleged childhood trauma, stating that "it is impossible, without corroborative evidence, to distinguish a true memory from a false one." Past life regression, meanwhile, is often viewed with skepticism.
Hypnotherapy involves achieving a psychological state of awareness that is different from the ordinary state of consciousness. While in a hypnotic state, a variety of phenomena can occur. These phenomena include alterations in memory, heightened susceptibility to suggestion, paralysis, sweating, and blushing. All of these changes can be produced or removed in the hypnotic state. Many studies have shown that roughly 90% of the population is capable of being hypnotized.
During a hypnotherapy session, the therapist will bring you into a state of deep relaxation in which the critical, conscious part of your brain recedes and the subconscious mind becomes alert and focused. The therapist will make suggestions, based on your intended goals, that will take root in your subconscious mind. These suggestions should affect your thinking in a positive way and empower you to make change.
As with other treatment providers, recommendations from family or friends are a great place to start. You can also check with a therapist, naturopath, or acupuncturist for recommendations. There are several databases of certified hypnotherapists online too. Try checking the American Society of Clinical Hypnosis’s database, or the General Hypnotherapy Register. You’ll want to check the therapist’s website before you choose, making sure to look for credentials and testimony from previous patients if available.