Dissociative personality disorder is a severe form of dissociation, a mental process, which produces a lack of connection in a person’s thoughts, memories, feelings, actions, or sense of identity. It is a condition in which a single person displays multiple distinct identities or personalities each with its own pattern of perceiving and interacting with the environment.

Along with multiple or split personalities, people with dissociative disorders may experience any of the following symptoms:

• Extensive inability to recall important personal information that cannot be explained by ordinary forgetfulness.
• Sudden anger without any cause.
• Depression, anxiety, passivity and dependence may be present.
• Visual or auditory hallucinations (sensory experiences that are not real, such as hearing voices) may occur.
• The presence of at least two distinct personalities with their own relatively enduring pattern of sensing, thinking about, and relating to self and environment.
• Sleep disorders, such as insomnia, nightmares, sleepwalking can occur.
• Distortion or loss of subjective time.