Flowers fold their petals; plants fold their leaves as evening falls. With the exception of owls and their nighttime predators, the creatures of land, sea, and air curl up into their bedroom niches in the rocks, trees, and sand. Dawn comes and the unfolding begins. The outside world, which has been barred from the senses of the sleepers, is once again admitted. This rhythm is the most natural thing in the world, intended no doubt to be accomplished effortlessly. Yet, many people find themselves disconnected by the natural flow of sleeping ....