Dealing with stress doesn't have to be stressful.
Perception depends on the complex functions of the nervous system but subjectively seems mostly effortless because the process happens outside of conscious awareness.
When we think about our life, past, present and or future we may feel that we are in a dream-like state; we may realise that we are thinking about something before we were aware that we had given it a thought.
When we think differently, we respond differently.
Thinking changes perception and it changes our physiology.
Thinking is never just thinking it is touching, tasting, smelling, hearing. It is living from mind to body and body to mind.