Freedom, Love, and the Two Deaths of Humanity

During this condition the physical body and etheric body lie on the bed, and his “I” and astral body are outside. During the night (if we speak somewhat inexactly) he callously abandons his physical and etheric bodies. But through being able to liberate himself during the night from his physical and etheric bodies, through being able to live at night in the spiritual world, it is possible for man during this earthly existence to work transformingly from his “I” upon his astral body. How does he do this?