Can you describe Sai Baba's unusual sleeping plank as detailed in Chapter 10?

Certainly. Chapter 10 provides a vivid description of Sai Baba's peculiar sleeping arrangement. He would rest on a narrow wooden plank, specified as being four cubits long and only one span (approximately 9 inches) wide. This plank was not placed on a support structure but was instead hung from the rafters of the mosque like a swing, suspended at both ends by old rags. The chapter adds that lamps were kept burning at his head and feet while he slept, and his movements when getting on or off this precarious bed were so subtle that they were imperceptible to onlookers.