The scriptures mention Sai Baba sleeping with four lit lamps. Can you explain why he did this?

The source material does not provide a specific reason for why Sai Baba, referred to as Maharaj, kept four lit lamps at the corners of his sleeping plank. According to Chapter 0, after a devotee named Nanasaheb Dengle brought a plank for him, Baba hung it from the rafters and began sleeping on it. The text states, "While sleeping, Maharaj would place four lit lamps at the four corners." However, it offers no explanation for this practice, focusing instead on the curiosity it generated among the people who gathered to watch him.