Derealisation and depersonalisation seen in which type of disorder

Depersonalisation: an altered sense of one's physical being, including feeling that one is outside of one's own body, physically cut off or distanced from people, floating, observing oneself from distance, as though in a dream. Derealisation: experiencing the environment as unreal or distoed. These are seen in Dissociative disorders. Ref: Synopsis of Psychiatry, 11e, pg 295.