Hyperarousal symptoms include difficulty falling or staying asleep, irritability or outbursts of anger, difficulty concentrating, being hypervigilant and finally, demonstrating an exaggerated startle response.
The third group of symptoms relates to what has been called hyperarousal, which means an emotional, mental and physical tendency to drive one's flight-or-flight nervous system too hard, a classic sign of which is a tendency to startle too easily.