Can you detail the unusual sleeping arrangement of Sai Baba as described in the tenth chapter?

Chapter 10 provides a fascinating description of Sai Baba's sleeping habits. He would sleep on a narrow wooden plank that was merely four cubits long and one span (about nine inches) wide. This plank was not placed on a frame but was hung from the rafters of the mosque, suspended at both ends by old rags, like a swing. The chapter notes that He would sleep on this precarious plank with lamps burning at His head and feet. Furthermore, his movements were imperceptible; no one ever knew when He climbed up to the plank or when He descended from it.