https://www.webmd.com/mental-health/what-is-hypervigilance
Hypervigilance — the elevated state of constantly assessing potential threats around you — is often the result of a trauma. People who have been in combat, have survived abuse, or have posttraumatic stress disorder (PTSD) can exhibit hypervigilance.
PTSD can be caused by a wide variety of incidents. Some of these traumatic events include:
- Living through a dangerous event
- Experiencing a serious or frightening injury
- Seeing another person get seriously hurt or die
- Feeling horror or extreme fear
- Experiencing trauma of any kind, and having no support afterward
- Living through multiple losses or traumas back-to-back
How my heart sings 