Dreaming is the subjective experience of imaginary images, sounds/voices, words, thoughts or sensations during sleep, usually involuntarily. It can be thoughts, visions, and other sensations that occupy the mind in sleep. Dreams occur during that part of sleep when there are rapid eye movements (REMs). Dreaming is an internal mental process of the physical body that normally occurs after it has fallen asleep. While we can classify dreaming as an internal mental process, dreams take place in another set of dimensions, dream dimensions.

Throw your dreams into space like a kite, and you do not know what it will bring back, a new life, a new friend, a new love, a new country.
-Anaïs Nin-