Hypervigilance is characterized by increased sensory response together with exaggerated intensity of behavior, combining to exhibit greatly increased response to perceived threats. It is usually accompanied with increased anxiety which can lead to fatigue and exhaustion. The patient will constantly be scanning the environment with all five of the main senses to respond to anything in the environment. It can lead to obsessive behavior patterns, an inability to interact socially, and a breakdown of relationships. It often makes sleep difficult or impossible.