Can you explain Baba's mysterious sleeping arrangement on the wooden plank as described in Chapter 10?

According to Chapter 10, Sai Baba's sleeping arrangement was quite extraordinary and mysterious. He would sleep on a narrow wooden plank, described as being only four cubits long and one span wide, which was suspended from the rafters like a swing using old rags. The chapter highlights the mystery by noting that lamps would burn at his head and feet, yet his movements of climbing onto and descending from this precarious plank were completely imperceptible; no one ever witnessed him doing so. This miraculous feat is attributed to the Great Siddhis (powers) residing within him, suggesting the plank's physical support was secondary to his spiritual power.