Can you explain the strange way Sai Baba used to sleep on that wooden plank mentioned in the Satcharitra?

Chapter 10 provides a fascinating description of Sai Baba's unusual sleeping arrangement. He would sleep on a narrow wooden plank, which was only four cubits long and a single span (about 9 inches) wide. This plank was not on the floor but was suspended from the rafters of the mosque, hung at both ends with old rags like a swing. What made it even more mysterious, as Chapter 10 highlights, was that Baba's movements were imperceptible; no one ever saw when he climbed up to the plank or when he descended from it. He would sleep on this precarious perch with lamps burning at his head and feet, a feat that defied normal physical explanation.