In the psychology subfield of oneirology, a lucid dream is a type of dream wherein the dreamer realizes that they are dreaming during their dream. The capacity to have lucid dreams is a trainable cognitive skill. During a lucid dream, the dreamer may gain some amount of volitional control over the dream characters, narrative, or environment, although this control of dream content is not the salient feature of lucid dreaming. An important distinction is that lucid dreaming is a distinct type of dream from other types of dreams such as prelucid dreams and vivid dreams, although prelucid dreams are a precursor to lucid dreams, and lucid dreams are often accompanied with enhanced dream vividness. Lucid dreams are also distinct state from other lucid boundary sleep states such as lucid hypnagogia or lucid hypnopompia.
A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. Humans spend about two hours dreaming per night, and each dream lasts around 5–20 minutes, although the dreamer may perceive the dream as being much longer than this.
Dream interpretation is the process of assigning meaning to dreams.
Nightmare disorder is a sleep disorder characterized by repeated intense nightmares that most often center on threats to physical safety and security. The nightmares usually occur during the REM stage of sleep, and the person who experiences the nightmares typically remembers them well upon waking. More specifically, nightmare disorder is a type of parasomnia, a subset of sleep disorders categorized by abnormal movement or behavior or verbal actions during sleep or shortly before or after. Other parasomnias include sleepwalking, sleep terrors, bedwetting, and sleep paralysis.
A false awakening is a vivid and convincing dream about awakening from sleep, while the dreamer in reality continues to sleep. After a false awakening, subjects often dream they are performing their daily morning routine such as showering or eating breakfast. False awakenings, mainly those in which one dreams that they have awoken from a sleep that featured dreams, take on aspects of a double dream or a dream within a dream. A classic example in fiction is the double false awakening of the protagonist in Gogol's Portrait (1835).
In the field of psychology, the subfield of oneirology is the scientific study of dreams. Research seeks correlations between dreaming and knowledge about the functions of the brain, as well as an understanding of how the brain works during dreaming as pertains to memory formation and mental disorders. The study of oneirology can be distinguished from dream interpretation in that the aim is to quantitatively study the process of dreams instead of analyzing the meaning behind them.
Dreamwork is the exploration of the images and emotions that a dream presents and evokes. It differs from classical dream interpretation in that it does not attempt to establish a unique meaning for the dream. In this way the dream remains "alive" whereas if it has been assigned a specific meaning, it is "finished". Dreamworkers take the position that a dream may have a variety of meanings depending on the levels that are being explored.
Anomalous experiences, such as so-called benign hallucinations, may occur in a person in a state of good mental and physical health, even in the apparent absence of a transient trigger factor such as fatigue, intoxication or sensory deprivation.
Pre-lucid dreaming is the beginning stages of inducing the lucid dreaming process. At this stage, the dreamer considers the question: "Am I asleep and dreaming?" The dreamer may or may not come to the correct conclusion. Such experiences are liable to occur to people who are deliberately cultivating lucid dreams, but may also occur spontaneously to those with no prior intention to achieve lucidity in dreams.
Dreamside is a fantasy novel by British author Graham Joyce, first published in the United Kingdom by Pan Books in 1991. It was later reprinted in the United States by Tor Books in 2000. The novel's primary themes are the power of the subconscious and the futility of attempting to escape the past.
Hypnopompia is the state of consciousness leading out of sleep, a term coined by the psychical researcher Frederic Myers. Its mirror is the hypnagogic state at sleep onset; though often conflated, the two states are not identical and have a different phenomenological character. Hypnopompic and hypnagogic hallucinations are frequently accompanied by sleep paralysis, which is a state wherein one is consciously aware of one's surroundings but unable to move or speak.
Psychoanalytic dream interpretation is a subdivision of dream interpretation as well as a subdivision of psychoanalysis pioneered by Sigmund Freud in the early 20th century. Psychoanalytic dream interpretation is the process of explaining the meaning of the way the unconscious thoughts and emotions are processed in the mind during sleep.
Age regression in therapy is a psycho-therapeutic process that aims to facilitate access to childhood memories, thoughts, and feelings. Age regression can be induced by hypnotherapy, which is a process where patients move their focus to memories of an earlier stage of life in order to explore these memories or to access difficult aspects of their personality.
Dream yoga or milam —the Yoga of the Dream State—is a suite of advanced tantric sadhana of the entwined Mantrayana lineages of Dzogchen. Dream yoga consists of tantric processes and techniques within the trance Bardos of Dream and Sleep Six Dharmas of Naropa. In the tradition of the tantra, the dream yoga method is usually passed on by a qualified teacher to his/her students after necessary initiation. Various Tibetan lamas are unanimous that it is more of a passing of an enlightened experience rather than any textual information.
Primary consciousness is a term the American biologist Gerald Edelman coined to describe the ability, found in humans and some animals, to integrate observed events with memory to create an awareness of the present and immediate past of the world around them. This form of consciousness is also sometimes called "sensory consciousness". Put another way, primary consciousness is the presence of various subjective sensory contents of consciousness such as sensations, perceptions, and mental images. For example, primary consciousness includes a person's experience of the blueness of the ocean, a bird's song, and the feeling of pain. Thus, primary consciousness refers to being mentally aware of things in the world in the present without any sense of past and future; it is composed of mental images bound to a time around the measurable present.
Scholarly interest in the process and functions of dreaming has been present since Sigmund Freud's interpretations in the 1900s. The neurology of dreaming has remained misunderstood until recent distinctions, however. The information available via modern techniques of brain imaging has provided new bases for the study of the dreaming brain. The bounds that such technology has afforded has created an understanding of dreaming that seems ever-changing; even now questions still remain as to the function and content of dreams.
Oneironautics refers to the ability to travel within a dream on a conscious basis. Such a traveler in a dream may be called an oneironaut.
Secondary consciousness is an individual's accessibility to their history and plans. The ability allows its possessors to go beyond the limits of the remembered present of primary consciousness. Primary consciousness can be defined as simple awareness that includes perception and emotion. As such, it is ascribed to most animals. By contrast, secondary consciousness depends on and includes such features as self-reflective awareness, abstract thinking, volition and metacognition. The term was coined by Gerald Edelman.
Content in Freudian dream analysis refers to two closely connected aspects of the dream: the manifest content, and the latent content. Impulses and drives residing in the unconscious press toward consciousness during sleep, but are only able to evade the censorship mechanism of repression by associating themselves with words, ideas and images that are acceptable to consciousness. Thus the dream as consciously remembered upon waking is interpreted in psychoanalysis as a disguised or distorted representation of repressed desires.
A dream character, sometimes abbreviated as DC, is an interactable human-like entity in the person's dream, especially while the person is REM-sleeping. The topic has been profoundly addressed in the lucid dreaming community, since while experiencing a lucid dream, the person can consciously interact with dream characters.
![An artist's dream diary, written as a comic strip. "We kept bones in the chest, in preparation for a magic spell [...] and all the while I had to keep up my best telephone voice." Skyrim Dream Comic.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0e/Skyrim_Dream_Comic.jpg/220px-Skyrim_Dream_Comic.jpg)