Can you describe Sai Baba's mysterious sleeping arrangements as detailed in the source text and what they imply about his nature?

Chapter 10 provides a fascinating account of Sai Baba's sleeping habits, which defied ordinary explanation. He would sleep on a very narrow wooden plank, just four cubits long and a span wide, which was suspended from the rafters by rags. The text highlights the mystery by noting that his movements were imperceptible; no one ever saw when he climbed up to or descended from this precarious perch. This is presented not as a simple feat but as an indication of his divine nature. Chapter 10 suggests that with Great Siddhis (powers) residing in him, the plank was merely symbolic, as the laws of physics did not constrain him. His ability to move unseen, perhaps in a minute form like an insect, underscored his mastery over the physical world.