Can you explain how Sai Baba's Udi helped the man from Bandra who was having nightmares?

According to Chapter 35, a gentleman from Bandra was tormented by nightly dreams where his deceased father would wake him with curses and abuse, causing him great distress and sleeplessness. After all other efforts failed, a Sai devotee advised him to use Sai Baba's Udi. The devotee instructed him to apply a little Udi to his head before sleeping, keep a packet of it under his pillow, and remember Shri Sai with devotion. As soon as he followed this advice, he fell into a deep sleep, and the bad dreams were completely erased. This illustrates the protective and healing power of the Udi, which has a 'natural tendency' to immediately remove such troubles.