Mammals are the most dehydrated when they wake from a long sleep and are thus the most in need of liquids to be their tonic. Could it be that the white noise from running water calms us in to a restful sleep not just because it might remind us of our deeply nurturing time spent in our mother’s womb—as is commonly suggested—but also as a primary survival trait that encourages us to rest when we are in earshot of a life-replenishing water source. The vibrations of the moving water grounds and relaxes us after a long day of adventuring abroad to places that might not have had drinking water possibilities; it’s lacking in an environment keeps us more on edge to truly rest as our bodies sense that they need to be in proximity to a water source. In the quiet of the early night when we are still alert and on the move, we are hunting not for the sounds of prey, but for the sounds of tomorrow’s water.
Just wanted to point out what I thought was another example of the tremendous foresight built in to our instincts, which is in contrast to the notion that has instincts painted as lowly and banal “animal” reflexes and reactions.