No: Myths & Misconceptions.
18 Myths About Hypnosis
A person must be deeply hypnotized to be helped.
You do not need to be in a deep state of hypnosis to benefit from it. Beneficial results can come from taking suggestions while in a light or medium trance. In fact, certain hypnotic methods can only be utilized if a client is not in a deep trance. For example, when dialoguing between parts of one's personality (so called "ego states") in order to integrate conflicting internal views, one should remain fully conscious while in a hypnotic state otherwise no dialog can occur.