Why did Shri Sai Baba sleep with four lit lamps around him?

The provided text from Chapter 0 describes how Maharaj slept on a wooden plank that was miraculously suspended from the rafters of the Masjid. It explicitly states, "While sleeping, Maharaj would place four lit lamps at the four corners." However, the source material does not offer any explanation for why he did this. It is presented as a factual detail of his unusual sleeping arrangement, which attracted much curiosity from onlookers, alongside the mystery of how he ascended and descended from the plank without anyone ever seeing him do so.