Can you describe Sai Baba's unusual sleeping plank and the mystery surrounding it as detailed in Chapter 10?

Chapter 10 provides a detailed description of Sai Baba's peculiar sleeping arrangement. He slept on a simple wooden plank that was four cubits long but only one span (approximately 9 inches) wide. This narrow plank was suspended from the rafters of the mosque with old rags, like a swing. The great mystery, as the chapter highlights, was that his movements were imperceptible; no one ever knew when he climbed up onto the plank or when he descended. The text questions how such a flimsy setup could even support his weight, concluding that it was only possible due to his Great Siddhis (divine powers), making the plank's function merely symbolic.