Some visitations are from entities who no longer take physical form.
Physical form was in the past for these entities, but they are spiritually evolved now, and take what would be called light form. The contactee is probably not aware of his contacts with these entities, unless in his dreams, which may or may not be consciously recalled. These entities have an extreme mental capacity, beyond what humans can endure. These entities have a force of love, also. Returning from a contact with these entities, the contactee feels as though he has risen from a warm bath into the cool air.