Boris has occasionally felt a sensation of being detached from his surroundings. He tells the social worker that he feels as if he were "in a dream" during these times. Boris's feelings of unreality most commonly occur when he is feeling overtired. What is the most likely diagnosis to consider for Boris?

Depersonalization disorder

Explanation:

Depersonalization disorder, also called derealization disorder is a dissociative disorder which  refers to the sense of feeling of disconnection an individual has from his or her thoughts or body and surroundings making them feel so unreal.

People with this disorder tend to always feel like they are outside thier body, without control of what to say or do with regards to thier emotions

Most people that have gone through a trauma such as  being involved in  an accident, or imprisonment find themselves with such disorder.

Boris feeling a sensation of constantly being attached from his surrounding, shows that he is probably suffering from Depersonalization disorder.

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