Can you describe Sai Baba's unique sleeping arrangements as detailed in the source material?

According to Chapter 10, Sai Baba had a very unusual sleeping arrangement. He would rest on a wooden plank that was just four cubits long and a mere span (about 9 inches) wide. This narrow plank was not on the floor but was hung from the rafters like a swing, suspended at both ends by old rags. To add to this curious sight, lamps would be kept burning at His head and feet as He slept. The text emphasizes that his movements onto and off this plank were imperceptible to onlookers.