> A Sufi Murshid (teacher) lived his entire life in a single town that consisted of a single pair of roads that met in the center of town. Late in his life, he stated that, he "knew the stars of the Milky Way better than he knew his town". (A love-consumed mystic remains conscious as our souls leave our bodies when we sleep. What is called astral travel is not limited by our physical body's speed laws; it is bounded only by the "speed of thought".)

Do you have any suggested material/resources where I can learn more?

This appears to only be in German: https://zwwa.de/

But this site has a few different languages, selectable in the upper-right corner of the page: https://mihr.com/

Note that the bulk of the teachings are about self-evolution via transmuting our vices into their corresponding virtues. It is that transformation that unlocks our ability to consciously travel during sleep.

The key to all such teachings is that becoming consumed by compassion is the real goal; all else is just added benefit.

As Steel Pulse put it so eloquently so long ago, "Love is the golden chord that binds all commandments." It is also the scaffolding that boosts our abilities to their greatest height; but, in reality, the spiritual path is really about stripping away our selfish ego-nature that impedes our realizing our full potential.

Peace be with you.