Yes, in Dissociative Identity Disorder (DID), it is possible for one personality state (often referred to as an "alter") to engage in self-destructive or harmful behaviors, while another personality state may be left unaware of what happened during that time. This phenomenon is one of the key features of DID and is known as "amnesia between alters."
When a switch between alters occurs, there is often a significant memory gap for the individual. The personality state that takes control (the "host" or "switching-in" alter) may have no memory or only partial awareness of the actions and experiences of other alters (the "switched-out" alter) during that time. This can lead to confusion, disorientation, and a sense of losing time for the person with DID.
Self-destructive behaviors may vary depending on the individual's specific alters and their roles within the system. Some alters may have protective roles and try to prevent self-destructive actions, while others may act out in ways that are harmful to the individual or others. The reasons behind these behaviors are complex and often tied to the person's history of trauma and coping mechanisms developed in response to their experiences.
It's important to note that DID is a severe mental health condition often resulting from a history of significant trauma, especially during childhood. The alter personalities serve as coping mechanisms to help the individual deal with overwhelming emotions and traumatic memories. Therapy for DID typically involves working to establish communication and cooperation among alters, addressing traumatic memories, and developing healthier coping strategies.
If you or someone you know is struggling with self-destructive behaviors or other mental health issues, it's essential to seek help from a qualified mental health professional. They can provide proper evaluation, diagnosis, and treatment to address the underlying issues and improve overall well-being.