I’ve lived my life predominantly under a cloud of self-protection. In some darkness. Some hiding.
It’s a natural response to the world for some people. As kids, particularly sensitive children, we hold our breath or body to protect ourselves from the bombardment of stimuli from the world, including arguing parents or unexpected barking dogs, etc.
Constriction is not bad. Left unconscious, though, it can leave patterns of stress and pain in the body-mind.