Can you explain the strange way Sai Baba used to sleep as described in Chapter 10 and what it signified?

According to Chapter 10 of the Shri Sai Satcharitra, Sai Baba's sleeping arrangement was quite miraculous. He would sleep on a narrow wooden plank, just four cubits long and one span wide, which was suspended from the rafters by old rags, like a swing. The text highlights that his movements were imperceptible; no one ever saw when he climbed up onto this precarious plank or when he descended. This feat was not a matter of physical skill but a demonstration of his Great Siddhis (divine powers). The chapter suggests that the plank could not have supported a person's weight on its own and was merely there for name's sake, implying Baba's powers, such as the ability to become minute ('Anima'), allowed for these impossible actions.