How does Chapter 10 describe Sai Baba's sleeping arrangements and what was so mysterious about them?

Chapter 10 of the Shri Sai Satcharitra provides a fascinating account of Sai Baba's sleeping habits. He would sleep on a very narrow wooden plank, described as being only four cubits long and one span (about nine inches) wide. This plank was suspended from the rafters of the mosque, hung at both ends by old rags, like a swing. Lamps would be kept burning at his head and feet. The most mysterious aspect, as detailed in Chapter 10, was that no one ever saw him get on or off this precarious perch. His movements were completely imperceptible, leaving devotees to wonder at the divine nature of this seemingly simple act.