The stages of sleep have been variously defined in terms of depth light, deep , electroencephalographic characteristics delta waves, synchronization , physiologic characteristics, and presumed anatomic level pontine, mesencephalic, rhombencephalic, rolandic.
Look closely at the characters, animals, objects, places, emotions, and even color and numbers that are depicted in your dreams.
It is the first stop in an education of both the good and the bad in life.