A state of altered consciousness characterized by the elimination of the logical mind, immersion in a deep state of relaxation and high concentration on a process. One of the ways to reach a trance, besides autosuggestion, is hypnosis by the therapist. However, drugs and mental illness can also cause trances. Common to trances is the severe restriction of sensory perceptions and sense of identity. During a trance, hallucinations and an aberrant sense of time and memory may occur. Waking hypnoses enable trance states that are indistinguishable to third parties from the normal waking state. In light trances, ego consciousness is still present, but in deep trances it has disappeared.