Astral Travel, or Astral Projection in dreams is an extremely simple and easy natural phenomenon like eating and drinking, etc. It is clear that when the physical body becomes slumbered, the soul then leaves it and travels everywhere.
When returning, when re-entering into its body again, the soul then often remembers the places where it was, the people with whom it spoke, etc.; usually people describe this phenomenon as dreams, yet indeed this is an astral projection. It seems to me that to become cognizant of one’s own natural phenomena can never be dangerous; one must become cognizant of the food that one eats, of what one drinks, of the state in which one’s health is and also of the process of astral projection that occurs in any living creature.
What you always perform in an involuntary and unconscious manner, learn to do it in a voluntary and conscious manner. You have always astral projected yourself, since all souls leave the body—unfortunately in an unconscious manner—at the moment when one is dozing; so, perform the same thing, but in a voluntary and conscious manner.
I repeat: when you began to feel that state of lassitude related to slumber, when you begin to doze, then imagine yourself to be like a subtle and vaporous ghost; think that you are going to leave your body; understand that you are not the body; understand that you are a soul; thus, feel yourself as being soul and then with smoothness and delicacy—as the souls rise—get up from your bed. What I am explaining to you must be performed in a concrete manner; this is not to a matter of thinking, but of actions!
Then as soon you get up, perform a small jump within your bedroom with the firm intention of floating in the environment; thus, it is clear that if you float, it is because you are already outside your physical body; then you can leave your bedroom and float in the atmosphere..
by ~ Samael Aun Weor
“One interesting technique is that of the dream state yogas. To practise them we should realize that we are dreaming, and then engage a certain practice deliberately. Because our mind has become already more subtle, then with little effort a still deeper state of consciousness can be utilized. When we do that we can develop a dream body. This special dream body is something separate from our physical body. It is a subtle body, and it can go many places and do many things. ” ~ 14th Dalai Lama
“When he dreams he takes away a little of the impressions of this world which consists of all elements (the waking state), himself puts the body aside and himself creates a dream body in its place, revealing his own splendor by his own light and dreams. In this state the Purusha himself becomes unmingled light.” ~ Upanishads (Bri. Up. IV.iii.9.)
“At night, strive to invoke the self-purification of confused dreams. Guard the three doors with the hook of mindfulness. Retain, purify, increase and transform the content of dreams, And eliminate all obstacles to practice. One rides on the sun and moon, travels to all buddhafields, And behold! All “good” and “bad” illusions become self-liberated.” ~ Naropa
“During the daytime, you should train in regarding your perceptions as being dreams.”