Can you describe the wooden plank that Sai Baba used for sleeping and how he used it?

Based on the details in Chapter 10, Sai Baba's sleeping arrangement was quite extraordinary. He slept on a wooden plank that was four cubits long but only a mere span, or about nine inches, wide. This narrow plank was suspended from the rafters like a swing, tied at both ends with old rags. The text highlights the miraculous nature of this, questioning how such a flimsy setup could support his weight. Chapter 10 further explains that Baba would sleep on this plank, often with lamps burning at his head and feet, and his movements—when he got on or off the plank—were completely imperceptible to anyone.