Most people have a vague understanding that rest is good for them. They know they should sleep more, slow down occasionally, and find ways to decompress. What very few people understand is what the body is actually doing during genuine rest: the specific biological processes that are only possible when the nervous system moves out of alert mode and into something far more restorative.

Most people can name the five classic senses without hesitation. Vision, hearing, smell, taste, touch. What rarely makes that list is the sense that governs nearly every movement you make throughout the day, the one that allows you to walk without watching your feet, reach for a glass in the dark, and adjust your posture without thinking.