In Savasana it's essential that the body be placed in a neutral position. In a supine position, release both legs, softening the groins, and see that the legs are angled evenly relative to the mid-line of the torso, and that the feet turn out equally. Narrow the front pelvis and soften (but don't flatten) the lower back. With your hands lift the base of the skull away from the back of the neck and release the back of the neck down toward the tailbone. If you have any difficulty doing this, support the back of the head and neck on a folded blanket. Broaden the base of the skull too, and lift the crease of the neck diagonally into the center of the head. Make sure your ears are equidistant from your shoulders. Reach your arms toward the ceiling, perpendicular to the floor. Rock slightly from side to side and broaden the back ribs and the shoulder blades away from the spine. Then release the arms to the floor, angled evenly relative to the mid-line of torso. Turn the arms outward and stretch them away from the space between the shoulder blades. Rest the backs of the hands on the floor as close as you comfortably can to the index finger knuckles. Make sure the shoulder blades are resting evenly on the floor. Imagine the lower tips of the shoulder blades are lifting diagonally into your back toward the top of the sternum. From here, spread the collarbones.
In addition to quieting the physical body in Savasana, it's also necessary to pacify the sense organs. Soften the root of the tongue, the wings of the nose, the channels of the inner ears, and the skin of the forehead, especially around the bridge of the nose between the eyebrows. Let the eyes sink to the back of the head, then turn them downward to gaze at the heart. Release your brain to the back of the head.