Which of the following is a symptom of post-traumatic stress disorder?

Detachment from others is a symptom of post-traumatic stress disorder (PTSD) as it relates to the emotional numbing and estrangement that individuals with PTSD often experience. This detachment can manifest as a sense of disconnection or isolation from friends and family, as those affected may struggle to engage with others emotionally. This symptom is part of the emotional and cognitive aspects of PTSD, which also include intrusive memories, avoidance of reminders of the trauma, and hyper-arousal responses.

In contrast, the other options suggest behaviors or states not typically associated with PTSD. High energy levels and increased interest in activities are more characteristic of mood elevation, as seen in certain mood disorders, while a reduced sleep requirement does not align with the sleep disturbances commonly reported in PTSD, which usually involve insomnia or disrupted sleep patterns rather than a decreased need for sleep. Thus, detachment from others accurately reflects a key aspect of the experience of individuals suffering from PTSD.