Can you tell me about Sai Baba's unusual sleeping arrangement and what it signified about his powers?

According to Chapter 10 of the Shri Sai Satcharitra, Sai Baba slept on a peculiar wooden plank that was four cubits long but only one span (about nine inches) wide. This plank was suspended from the rafters by rags, like a swing. The text highlights that his movements—when he got on or off this precarious plank—were imperceptible, and no one ever saw him do it. Chapter 10 explains that the plank's ability to support him was not due to its physical strength but because of Baba's great Siddhis (powers). It suggests that Baba possessed 'Anima,' the power to become minute, allowing his movements to be as subtle and unnoticeable as those of flies or insects.