Based on the provided text, what details does Chapter 10 give about Sai Baba's daily life and sleeping arrangements?

In Chapter 10, after a discussion on spiritual matters, the focus shifts to Sai Baba's lifestyle. It notes that His movements were often imperceptible, adding to his mystique. The chapter provides a specific and intriguing detail about His sleeping habits, questioning how and where He slept. It then reveals that He slept on a suspended wooden plank that was merely four cubits long and one span, or approximately nine inches, wide. This description highlights the unusual and austere nature of His physical existence, setting the stage for further stories about His divine life.