Susceptibility to hypnosis is the capacity of going into a hypnotic trance. Most hypnotists believe that the vast majority of the population can be hypnotized rather easily. It depends mainly on the emotional state of hypnosis subject and few other factors. Often the same person who enters into a deep trance very quickly have problems with getting hypnotized just few days later. It also works in opposite way. A person who has difficulty with getting relaxed lose them completely after their first hypnotic trance.

It should be noted that people who learn how to consciously enter into hypnotic trance enters it with less effort each time they use their hypnosis technique. Of course this is not a rule. One of the hypnotherapists states that about 5% of population cannot be hypnotized at all and just 25% can get in the deepest trance. According to him all the rest reaches different intermediate states of hypnosis. Other specialists and hypnotherapists achieves much better results which may be the result of a better approach to hypnotized person. For example Bernheim – claims that at the hospital 80% of the patients attained the state of deep hypnosis, while from the people hypnotized privately only 20%.

Susceptibility to hypnosis is not dependent on gender, education and intelligence. By contrast, it depends on:
- Age – from 5 to 17 years, somewhat higher than in other age groups
- The relationship between the hypnotist and hypnosis subjects (prejudices and animosities creates bad prognosis)
- Subject’s ideas on idea of hypnosis and value of the hypnotist.

It is worth noting that those who are somnambulists (sleeping deep, having difficulty distinguishing waking from sleep, walking in sleep) are very susceptible to hypnosis and easily fall in deep trance.

Required depth of trance.
Required depth of trance should be understood as the plan to implement suggestions structured according to the level of difficulty. This means that the command that are more difficult for hypnotized ought to be passed in the greater depth a trance. In addition, hypnotherapists use selected suggestions to determine the depth of trance. These are appropriately selected suggestions that are not too difficult to implement.

Two commonly used scales for the depth of trance.
- Descriptive Scale.

According to Forel hypnosis can be divided into three main stages:
- Light (i.e. somnolence sleepiness – is characterized by fatigue, and relaxation).
- Average (light sleep) – hypnotized subject can not open your eyes, but does not lose memory.
- Deep-(somnambulism, or deep sleep) – subject can open your eyes in a trance, speak and walk.

There are few easy ways to check how deep you can hypnotize yourself. See three basic hypnosis tests in hypnosis how to post which is continuation of this article.