Happiness, love, and wisdom aren’t furthered by shutting down the SNS, but rather by keeping the autonomic nervous system as a whole in an optimal state of balance: Mainly parasympathetic arousal for a baseline of ease and peacefulness Mild SNS activation for enthusiasm, vitality, and wholesome passions Occasional SNS spikes to deal with demanding situations, from a great opportunity at work to a late-night call from a teenager who needs a ride home from a party gone bad This is your best-odds prescription for a long, productive, happy life.