Of course, as God Almighty, Yahweh could just kick back and settle right into the Stillness. In fact, God being God, he/she is the Stillness, the Infinite Source at the foundation of all sound, all activity.
It takes Practice.
Immersed in the buzz of contemporary society (which, itself, could be diagnosed as ADHD), most of us have internalized the incessant noise and relentless activity of a social system build on greed, fear, and ignorance. The noise and activity doesn't just exist "out there." It lives on in our bodies, our emotions and, perhaps most of all, in our thoughts. Even at relative rest, our minds are usually abuzz. Lost in our thoughts, we often feel stressed. It is often acted out (and reinforced) through constant movement. Even "at rest", there is liable to be gum chewing, toe tapping, hair twirling, nail-biting, etc.
Thankfully, in this day and age we also have access to an entire world of Spiritual Teachings, and to meditative practices developed through the ages to free us from this vicious cycle of incessant physical and mental activity. I'm grateful to have stumbled across this vast pool of wisdom as a young man. I have maintained a regular meditation practice for decades.