How was Sai Baba's Udi used to cure the man from Bandra who suffered from bad dreams?

A gentleman from Bandra was tormented by nightly dreams of his deceased father, causing him to lose sleep. As detailed in Chapter 35, a Sai devotee advised him to use Udi, as all other efforts had failed. The specific instructions were to apply a little of the sacred ash to his head before sleeping, tie a packet of it to keep under his pillow, and most importantly, remember Shri Sai with devotion in his heart. The text states that as soon as he followed this advice, he fell into a deep sleep, the bad dreams were completely erased, and the gentleman was very happy.