The way a session is conducted now has become very different to how it was in the past. The advance in science has helped us to explore the depths of the brain. What researches do know comes from the study of the people who have been hypnotized. Hypnosis is closely linked with dreaming. When a person enters into a hypnotic state they can get the same rapid eye movement (REM) that happens when a person is sleeping. We can also measure the electrical activity of the brain using a method called electroencephalography (EEG). This method is used to measure the electrical activity known as the brain waves. That being said it is still not easy to measure hypnosis as it has different effects on different people. Some people may feel relaxed but as if nothing had really changed although some people