depersonalization

Depersonalization (or depersonalisation) is an anomaly of self-awareness. It can consist of a reality or detachment within the self, regarding one's mind or body, or being a detached observer of oneself. Subjects feel they have changed, and the world has become vague, dreamlike, less real, or lacking in significance. It can be a disturbing experience. Chronic depersonalization refers to depersonalization/derealization disorder, which is classified by the DSM-5 as a dissociative disorder.