Sefer HaZohar on the Stones Jacob Arranged

"And arranged them מראשותיו at his 'heads' [the literal translation]. At whose heads? At the heads of that place. What does this mean? If you say, 'Like a person putting something under his head' - no! Rather, at its heads, at the four heads, directions of the world: three stones to the north, three to the west, three to the south, three to the east, with that place above them arrayed upon them. Then, 'he lay down in that place'. Once the bed was prepared, he lay upon it. Who lay upon it? The sun."

-- Sefer HaZohar, 1:148a


This Zohar passage contains an esoterically encrypted meditation exercise. The specific step-by-step directions and geometrical placements will be obvious to those who already know them; the upshot here is to link this practice to the recitation of the verse from the Torah.