The concept was popularized in Inception, where lucid dreamers could link up via technology and roam around the unconscious of a single dreamer. And could you test this yourself by learning how to lucid dream? In reality, mutual dreaming is very unlikely to exist - although we may, one day, develop technology to allow us to share "dreams". This doesn't mean people can't share what seem like mutual dreams.
Detailed Review Summary of Awake and Dreaming by Kit Pearson
The lives of all organisms, including humans, are influenced by regularly occurring cycles of behaviors known as biological rhythms. One important biological rhythm is the annual cycle that guides the migration of birds and the hibernation of bears. Women also experience a day cycle that guides their fertility and menstruation. Many biological rhythms are coordinated by changes in the level and duration of ambient light, for instance, as winter turns into summer and as night turns into day. In some animals, such as birds, the pineal gland in the brain is directly sensitive to light and its activation influences behavior, such as mating and annual migrations.
The Dreaming , also referred to as Dreamtime , is a term devised by early anthropologists to refer to a religio-cultural worldview attributed to Australian Aboriginal beliefs. It was originally used by Francis Gillen , quickly adopted by his colleague Baldwin Spencer and thereafter popularised by A. Elkin , who, however, later revised his views. The Dreaming is used to represent Aboriginal concepts of Everywhen during which the land was inhabited by ancestral figures, often of heroic proportions or with supernatural abilities.
A dream is a succession of images , ideas , emotions , and sensations that usually occur involuntarily in the mind during certain stages of sleep. Dream interpretation is the attempt at drawing meaning from dreams and searching for an underlying message. The scientific study of dreams is called oneirology. Dreams mainly occur in the rapid-eye movement REM stage of sleep —when brain activity is high and resembles that of being awake.