In ancient times, humans (the cavemen) needed to be on their toes all the time. Even while sleeping, they couldn’t afford to let their guard down. Otherwise they will be HUNTED OR KILLED BY THE PREDATOR animals.
But a man has got to sleep, to rejuvenate, to be up and about. At the very least, they had to sit and relax.
They built a coping system to be active whenever there is an emergency. To run, or fight , you need energy. Energy comes from ATP. ATP is formed when our food elements are burnt. When we stress, adrenaline is boosted in our brain. Adrenaline is basically the hormone that causes our body’s glucose to burn. With the glucose burnt, ATP (energy) is formed. So as we stress, we are forming energy to GET ON ROLL.
With energy formed, they were prepared for a FIGHT or RUN against any sudden attack. This method of ‘voluntary stress’ worked pretty well for them. Basically they would be like an archer with a cocked arrow.
Since this practice was raised and celebrated among our ancestor humans, this habit of creating and feeling unreasonable stress ingrained in our human DNA.
Long story short : we humans are hardwired to stress.
Ironically, this culture was in the first place brought under then-circumstances. Living in the fear of being devoured as you sleep and so on.
But this culture of stress is UNREASONABLY taking up way too much from us. This was definitely not supposed to be it.
Know Your Instincts 