Can you describe Sai Baba's unusual sleeping plank and how he used it?

Chapter 10 provides a fascinating description of Sai Baba's sleeping arrangement. He would sleep on a wooden plank that was merely four cubits long and one span (about nine inches) wide. This narrow plank was suspended from the rafters of the mosque with old rags, like a swing. The text notes that lamps would burn at His head and feet while he rested on it. A truly remarkable aspect mentioned in this chapter is that his movements were imperceptible; no one ever knew when he climbed up onto the plank or when he descended from it.