Hypervigilance ALT Hypervigilance is a heightened awareness of your surroundings. It&rsquo;s a common symptom of PTSD, as well as a few other conditions. If you experience hypervigilance, then you might feel like you&rsquo;re always on edge, easily startled, oversensitive to danger, or unable to relax and feel safe. You might notice that your body reaches for a fight-or-flight response much more…