Can you describe Sai Baba's unusual sleeping arrangement as detailed in Chapter 10 and explain what it signifies about his nature?

According to Chapter 10, Sai Baba had a very peculiar sleeping arrangement. He would sleep on a narrow wooden plank, described as being four cubits long and only one span (about 9 inches) wide. This plank was suspended from the rafters of the mosque with old rags, like a swing. What made this remarkable was not just the precariousness of the plank, but that his movements were imperceptible; no one ever saw when he climbed up or descended from it. The text suggests this was possible due to his great Siddhis (powers), and that the plank itself was 'merely for name’s sake.' This illustrates his mastery over the physical world and his ability to perform acts that defy normal human capabilities, as mentioned in Chapter 10.