Does the Mind need to keep thinking?

A shark needs to keep moving in order to remain alive.  Otherwise it would die for lack of oxygen.  I wonder if the human mind needs to keep thinking in order not to sink to the bottom of its ocean.  Like radio waves, which convey the desired message onto a regular pulse, I wonder if part of thought is like a regular pulse modified by sensations, emotions, etc.  One of the men who collaborated to devise the science of cybernetics (from which computers have evolved)–Warren Mccollough–presented (if I remember correctly) the activity of thinking mind as the confluence of pulsing waves going one way in the brain which are then modified by the brain’s variable activity moment to moment.  I wonder if our sense that the brain is always generating thoughts may refer to these kinds of characteristics, and that irrespective of anything consequential or provoked by experience, our minds are regularly sweeping (like the constant rotations of a boat’s radar) just in case there is a shoal or floating log ahead. –Michael