to add to this, your brain has fine priorities, but only for life in some small tribe in a wilderness survival situation.
take for example diet: if food is scarce, eating as much as you can during times of plenty means you can go back on your reserves when starvation comes. only, starvation is probably never coming in our cases. in a similar vein, your body expects you to be forced to move around all day, maybe build with wood, do agriculture, hunt some animals, etc. so you are programmed to avoid extra strain if at all possible, which, if no physical labour is required for survival, manifests in lying around all day.
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