The answer is the sympathetic nervous system. This regulates
the reactions of the body to an acknowledged threat and is accountable for the
"fight or flight" reaction. Over time, this over-stimulation of the
SNS can go to clear-cut marks of imbalance like: anxiety, shallow breathing,
augmented heart rate, poor quality sleep, restlessness, night
sweats, increased agitation/irritability, fatigue, and
nervousness just to name a few.
The answer you are looking for is "genes".
