Can you explain the specific techniques of 'mental worship' that Baba taught, as mentioned in the story of the man with bad dreams?

The source text does not detail specific techniques for 'mental worship' taught by Sai Baba. It describes the experience of a gentleman who was cured of bad dreams and sleep troubles after receiving Udi from Baba. As mentioned in Chapter 35, this gentleman kept the packet of Udi under his pillow, brought home a picture of Baba, and placed it on the wall. He would offer a garland on Thursdays and performed 'mental worship daily.' The text states this disciplined practice helped him, but it does not elaborate on what the mental worship consisted of, beyond the context of remembering Sai constantly and offering respect to his picture.