Can you describe Sai Baba's unusual sleeping plank from Chapter 10 and explain what it signifies?

Chapter 10 provides a detailed description of Sai Baba's peculiar sleeping arrangement. He would sleep on a wooden plank that was merely four cubits long and one span (approximately 9 inches) wide. This narrow plank was suspended from the rafters of the mosque like a swing, tied at both ends with old rags. The chapter emphasizes that Baba's movements of climbing onto and descending from this precarious perch were imperceptible to anyone. It clarifies that the plank's ability to support Him was not a matter of physics but a display of His great Siddhis (divine powers), suggesting the plank was merely "for name’s sake" and a testament to His mastery over the physical world.