Where do dreams come from? Or, why do we dream?
Various answers have been given over time. Some say that dreams are nothing but a reflection of our waking experience in a new form. The medical view states dreams are due to some organic disturbances somewhere in the body, but more particularly in the stomach.
Your dreams tell you about your present state of awareness, this is why we dream. Dreams come from an inner place we call the subconscious mind and are presented to you in images which, when interpreted in the "Universal Language of Mind", become personally relevant to you and your life. The meaning of these nighttime messages can literally change your life.
Here's something to think about:
The object of all yoga is to wake up: to first experience and then become clear light. So, “dream” yoga is one that uses the dreamlike nature of reality, whether asleep or awake, as an aid to wake up – to become lucid and to become enlightened.