I've been informed recently of a path of Yoga, called Yoga Nidra.

Yoga Nidra is a deep relaxation, a place of meditative consciousness based on lucid wakefulness in the sleep state.

Here is where liberation, freedom of the spirit is consciously aware of itself.

It brings one to their consciousness in the deeper, esoteric layers, deep to the causal level / realm.

If know anything on this topic please share. I will be looking into this further and sharing what I come up with. I wonder if it like that of astral travel, accessing akashic records etc.