Science describes ever more precisely what happens in the brain during sleep. Yet the symbolic meaning of dreams remains beyond the scanner’s reach. See where certainty ends and legitimate interpretation begins.
What science says
Modern sleep neurobiology distinguishes two main stages that cycle throughout the night. NREM (non-rapid eye movement) sleep is divided into three stages and is characterized by a gradual slowing of brain activity, the dominance of delta waves in deep sleep, and the absence of vivid dreaming. REM (rapid eye movement) is the stage that has fascinated researchers for decades: the eyes move rapidly, the body is almost paralyzed, and the brain shows electrical activity similar to wakefulness. It is in REM that most of the dreams we remember are born.
A breakthrough in understanding what happens during dreaming was the activation-synthesis hypothesis formulated by Hobson and McCarley (1977). According to it, dreams arise from chaotic activation of signals from the midbrain, which the cortex then tries to organize into a coherent narrative. In other words: the brain receives random noise and turns it into a story. This concept was revolutionary because it stripped sleep of its mystery in a mechanistic sense, though it by no means explained why the stories created by the brain are so deeply personal.
Equally important are the findings concerning the function of REM sleep in memory processing. Walker and Stickgold (2004) showed that REM sleep plays a key role in the consolidation of emotional and procedural memory, pointing to an active role of dreams in processing experiences from the previous day. This is not passive archiving: during sleep, the brain actively reinterprets, combines, and hierarchizes memories. Stickgold, Hobson, Fosse, and Fosse (2001) went further, confirming that during sleep the brain reintegrates fragments of memories into new associations, which may form the neurobiological basis for the symbolic and metaphorical connections present in dreams. This sentence is worth reading twice: science itself provides a mechanism that explains why dreams think in images and metaphors rather than in protocols.
A parallel line of research is the evolutionary view of dream function. Revonsuo (2000) proposed threat simulation theory, suggesting that dreams evolved to practice responses to danger. Fearful dream content is therefore adaptive, not pathological. This is an important correction: if you dream of fleeing, of being chased, or of an exam you are unprepared for, your brain is not signaling illness. It is training.
Especially important for understanding the specific nature of dream experience are the findings of Nir and Tononi (2010), who showed in a review that during REM, deactivation of the dorsolateral prefrontal cortex is responsible for reduced critical thinking and volitional awareness during dreams. This explains why in a dream you do not find it strange that you are flying, that your grandmother is alive, or that the house has sixty floors. The part of the brain responsible for rational verification is largely switched off. What remains active are the visual cortex, the amygdala responsible for emotions, and memory structures. So you dream emotionally, visually, and through association. Exactly the way symbolic images work.
An especially interesting separate thread concerns lucid dreams. Dresler and colleagues (2012) showed that in lucid dreams, reactivation of the dorsolateral prefrontal cortex is observed, confirming that metacognition during sleep is neurophysiologically possible and measurable. You can be aware that you are dreaming, and that awareness leaves a trace in the fMRI scanner. The boundary between sleep and wakefulness is therefore not absolute, but gradual.
Finally, it is worth mentioning Domhoff’s long-term research (2003), which in an extensive monograph showed that dream content is largely a continuity of concerns and relationships from waking life. You dream about what occupies you, unsettles you, and engages you emotionally. This undermines both the notion of dreams as purely random and the view of sleep as a gateway to a reality radically different from everyday life. Dreams are rooted in your life, even if they speak about it in the language of metaphor.
From books
Scientific discoveries of recent decades gain deeper context when set alongside both popular science and classical humanistic literature.
“REM sleep is like overnight emotional therapy: it works through painful memories, stripping them of their fear charge while preserving their content. You wake up with a better perspective not because you forgot, but because the brain rewrote the emotional meaning of the experience.”
Matthew Walker, “Why We Sleep: Unlocking the Power of Sleep and Dreams” (2017)
Walker, a neuroscientist from Berkeley, summarizes decades of research into the function of REM sleep in an accessible way. His concept of overnight emotional therapy corresponds well with what practitioners observe in work with clients: bringing a dream image into a therapy session and speaking it aloud can in itself be healing. Not because the dream is a prophecy, but because the brain works through during sleep what it did not have time to process during the day.
Carl Gustav Jung, in his work “Über die Psychologie des Unbewussten” (1917), introduced concepts that still form the foundation of psychological work with dream symbolism: the collective unconscious and archetypes. For Jung, dreams are not distorted wish fulfillment (as in Freud), but the spontaneous production of the unconscious, which speaks the language of symbols common to the entire human species. Water, fire, mother, shadow, tower, road. These images appear in dreams regardless of culture, era, or personal history. Jung did not claim that a dream predicts the future. He claimed that it compensates for one-sided conscious attitudes, pointing to what has been overlooked or repressed.
Sigmund Freud, in “Die Traumdeutung” (1899), was the first to propose a systematic psychological interpretation of dreams, calling them the “royal road to the unconscious.” Although many of Freud’s detailed claims have been challenged by science (above all the notion of dreams as a disguised fulfillment of sexual wishes), his method of free association remains a proven therapeutic tool. The question is not: “what does water mean in a dream dictionary?” but: “what does this water, for you specifically, bring to mind?”
G. William Domhoff in “Finding Meaning in Dreams” (1996) proposed an empirical methodology for dream analysis based on quantitative content analysis of thousands of reports. His research shows that dream content patterns correlate with personality traits, relationships, and the dreamer’s current concerns. This middle ground between subjective interpretation and hard science is a bridge worth pausing on.
Kelly Bulkeley in “Dreaming in the World’s Religions” (2008) demonstrated in a comparative study that symbolic dream interpretation is a culturally universal phenomenon: present in Greek, Egyptian, Mesopotamian, Hindu, Tibetan, Islamic, and Christian traditions. Regardless of geography and era, people gave dreams meaning and treated them as messages. This does not make dream dictionaries scientifically proven, but it gives them anthropological weight that cannot be ignored.
From practitioners’ experience
Academic and clinical knowledge meets practice in therapy offices, meditation halls, and card-reading spaces. Here is what people who work with dream content every day say.
An integrative psychotherapist working in the Jungian method asks clients to keep a dream journal for at least four weeks before the first session. She observes that recurring images (house, water, unknown figure) often correspond to the client’s current emotional conflicts. She does not treat these images as prophecies, but as material for projection and inner dialogue. She also emphasizes something important: even if we accept a neurobiological interpretation of dreams as information processing, the very act of assigning meaning to those images is therapeutically valuable. It is not the dream that heals, but the relationship you build with its content.
A mindfulness meditation teacher with experience in the Tibetan tradition introduces the practice of “dream yoga” as an extension of everyday awareness. She reports that among advanced practitioners, the ability to dream lucidly increases, which is consistent with Dresler et al.’s (2012) research on prefrontal cortex reactivation. The goal, however, is not to control the dream, but to observe its content without identification. What appears to be an esoteric practice has its neurobiological correlates.
A tarot reader working in a psychological approach, combining card reading with dream analysis, notices clear parallels between card symbolism and clients’ dream images. The same archetypes of water, tower, guide figure appear both in dreams and in drawn spreads. She explains to clients that cards and dreams work on the same level: the language of image and metaphor. Neither of these tools predicts the future. Both reveal current psychic tensions, creating space for reflection. If you want to explore the symbolic language of cards in this spirit, it is worth visiting the card interpretation section in the Ezostylia app.
An herbalist and holistic therapist working with adaptogenic herbs observes that clients using valerian root or ashwagandha subjectively report more intense dreams and better dream recall. She does not attribute this effect to magic, but to improved deep sleep quality (which is consistent with pharmacological data). She treats altered dream activity as an entry point for conversation about the client’s mental state. Dreams become a mirror, not an oracle.
The history of dream dictionaries and the cultural dimension of interpretation
Long before neurobiology, people tried to understand dreams for thousands of years. Egyptian papyri from the Middle Kingdom, including the famous Chester Beatty Papyrus from around 1279 BCE, contain lists of dream symbols with assigned meanings: good omen or bad omen depending on the context. Mesopotamian cuneiform tablets, Greek oracle practices connected with dream incubation (dreaming in a sacred space while awaiting divine revelation), Talmudic dream commentaries, Islamic interpretation manuals, Indian tantric traditions of working with dreams: all assume that dreams carry information worth decoding.
Bulkeley (2008) shows that regardless of the theology or cosmology a given tradition adopts, the interpretive mechanism is astonishingly similar: the dream image is compared with a symbolic dictionary of that culture and placed within the dreamer’s life context. This is not magical thinking. It is a search for language for what the unconscious brings to the surface when the rational sensor is switched off.
Depth psychology versus neurobiology: alliance or contradiction?
A common mistake is to oppose Jung and Freud to modern neuroscience as if they were describing different things. In fact, they describe the same thing at different levels. Neurobiology speaks of structures, neurotransmitters, and brain waves. Depth psychology speaks of meaning, psychic function, and the relationship of image to an individual’s life. These are not competing theories. They are different layers of the map.
The fact that the visual cortex is active during REM explains why dreams are so vividly visual. It does not explain why your brain generates the image of a sinking ship on the night after an argument with your partner. The fact that the amygdala is activated explains the emotionality of dreams. It does not explain why the emotion of fear takes the shape of a specific persecutor figure, which looks different for different people but serves the same symbolic function.
Jung would say: because it speaks in archetype. A neuroscientist would say: because your associative cortex combines fragments of memory into narrative structures aligned with the strongest emotional patterns. Both are right. Neither says everything.
Science’s skepticism toward dream dictionaries: where the evidence is strong, and where it is lacking
An honest approach to the topic requires a clear statement of what science confirms and what it does not.
- Science confirms that REM and NREM sleep fulfill active biological and psychological functions.
- Science confirms that dream content is linked to the emotional experiences and relationships of waking life (Domhoff, 2003).
- Science confirms that lucid dreams have measurable neurobiological correlates (Dresler et al., 2012).
- Science confirms that sleep supports memory consolidation and emotional processing (Walker and Stickgold, 2004).
- Science does not confirm that a specific symbol in a dream has one fixed meaning independent of the dreamer.
- Science does not confirm that dreams predict the future.
- Science neither confirms nor disproves Jung’s concept of the collective unconscious, because it lies beyond the current scope of empirical methods.
This distinction matters. Dream dictionaries as symbol glossaries (what water means, what fire means) do not have empirical confirmation in the sense that “if you dream of water, it means X.” But they do have heuristic value: they suggest possible associations that the dreamer may accept or reject in the context of their own life. This is not fortune-telling. It is structured reflection.
How to use this in practice
Knowledge of dream neurobiology and the tradition of symbolic interpretation do not have to exclude each other. You can use both, while staying aware of what each layer does.
- Keep a dream journal. Write down your dreams immediately after waking, before prefrontal cortex activity has a chance to “rationalize” them or erase them from memory. A few sentences are enough. Over time, you will begin to notice recurring images, figures, and places. This is your personal symbolic dictionary.
- Ask what it means to you. When the image of water, a house, or a stranger appears, instead of reaching straight for a dream dictionary, ask yourself: what does this word or image awaken in me? What memory, emotion, or association? Freud’s free association method is simple and effective.
- Use a dream dictionary as a hint, not a verdict. The Ezostylia dream dictionary offers symbolic meanings that you can compare with your own associations. If the suggested meaning resonates, take it as a starting point for reflection. If it does not resonate, set it aside.
- Compare dreams with cards. If you work with tarot or oracle cards, try drawing a card with the question: “What is this dream telling me?” and treat it as an additional image for conversation. Not as the answer, but as another mirror. A detailed approach to Ezostylia card symbolism can be found in the cards section.
- Take care of sleep quality. Neurobiology is clear here: without enough REM sleep, there is no emotional processing. If you want to remember dreams and benefit from them, maintain a regular circadian rhythm, avoid alcohol (which suppresses REM), and create conditions for deep sleep. You can support this process with herbs such as valerian or ashwagandha, which practitioners report may ease sleep difficulties and support depth of sleep.
- Consider a meditation practice. Regular mindfulness meditation, available in the meditation section of Ezostylia, supports the ability to observe your own mental states, which translates into better dream recall and understanding.
Dreams, Tarot cards, and oracle cards: the symbolic language of image as a tool for reflection
Ezostylia tarot and oracle cards, in the energy of this deck and according to the interpretation of the Author of the Cards, work on the same level as dreams: they are the language of image, addressed to the same part of the psyche that generates dreams. Visual cortex, amygdala, associative memory networks. When you draw a card and hold your gaze on its image, you activate similar mechanisms to those that build a dream narrative.
This is not accidental. Cards, like dreams, work as projection: your psyche gives meaning to the image according to what is currently alive within it. The Tower card does not say something will fall apart. It says: look at what in your life is trembling at the foundations. The Water card does not say you will drown. It asks: what in you flows, what do you not control? This is the same mechanism that makes a dream of a flood an image of overwhelming emotion for one person, a symbol of purification for another, and an echo of a specific past fear for yet another.
The tarot reader whose experience we draw on in this article puts it well: cards and dreams are two entrances to the same basement. You can enter from the side of night or from the side of image. In both cases, you will find what is waiting for awareness.
An integrative model: neurobiology as map, symbolism as compass
At the end, it is worth proposing a way of thinking that connects both perspectives without reducing either of them.
Neurobiology is a map: it describes the terrain, meaning the mechanisms that generate dreams, their stages, neural correlates, and biological functions. A map is invaluable. Without it, you would wander in the dark, assigning a literal prophecy or pathology to your dreams. Thanks to the map, you know that a nightmare is not a sentence, that fear in a dream has an evolutionary basis, that REM sleep processes emotions rather than generating mystical revelations on demand.
Symbolism is a compass: it does not describe the terrain, but it indicates direction. A compass does not tell you that there is a forest beyond the hill. It says: go north. A dream dictionary, a card, Jungian amplification of a symbol: none of these tools can tell you with certainty what your dream “means.” They can tell you which way it is worth turning. And that is enough.
A map without a compass is information without direction. A compass without a map is direction without context. Together they allow you to move through a terrain that is fascinating, complex, and still not fully explored: the terrain of your own psyche.
If you want to deepen your work with symbolism and intuition, it is also worth visiting the other articles on the Ezostylia blog, where you will find texts about numerology, runes, the matrix of destiny, and other tools of symbolic reflection.
FAQ
Do dream dictionaries have a scientific basis?
Dream dictionaries as symbol glossaries do not have empirical confirmation in the sense that “this symbol always means the same thing.” Science does, however, confirm that dream content is linked to the dreamer’s emotions and relationships (Domhoff, 2003), and that the process of assigning meaning to dream images has psychological value. It is best to treat a dream dictionary as a set of possible associations, not as a ready-made key to translation.
Why don’t I remember my dreams?
Dream recall depends on several factors: the quality of REM sleep, cortisol levels after waking, and above all the moment you wake up. We remember dreams best when REM is interrupted, meaning when the alarm goes off in the middle of a dream. Keeping a dream journal and writing dreams down immediately after waking (before you get up and do something else) significantly improves dream memory.
Can dreams predict the future?
Science provides no evidence for dream precognition. What is sometimes interpreted as prophecy can usually be explained by retrospective confirmation (we remember dreams that “came true” and forget those that did not), by the fact that we dream about issues already occupying us and likely to happen anyway, or by the fact that our behavior after a “prophetic” dream really changes the situation. If a dream prompts you to reflect and change, its value is real. Not because of prophecy, but because of the self-awareness it awakens.
Can working with Tarot cards help in understanding dreams?
Yes, and in several ways. Cards, like dreams, work in the language of image and metaphor, engaging the same associative networks. Drawing a card after reading a dream from your journal can provide a new angle: not as an answer, but as an additional question. According to the interpretation of the Author of the Cards in Ezostylia, this form of work is a form of reflection, not prophecy. If you want to try, you can start with the card section available in the app.
Can herbs affect dream quality?
Some herbs, such as valerian root and ashwagandha, are associated in herbal tradition and preliminary pharmacological studies with easing sleep difficulties and improving sleep quality. Some users report more intense dreams and better dream recall. These effects are most likely the result of improved deep sleep quality rather than directly “generating” dreams. Herbs can support sleep, but they do not replace sleep hygiene or professional help in the case of more serious disorders.
Sources
- Hobson, J.A., McCarley, R.W. (1977). The brain as a dream state generator: an activation-synthesis hypothesis of the dream process. American Journal of Psychiatry.
- Walker, M.P., Stickgold, R. (2004). Sleep-dependent learning and memory consolidation. Neuron.
- Revonsuo, A. (2000). The reinterpretation of dreams: an evolutionary hypothesis of the function of dreaming. Behavioral and Brain Sciences.
- Nir, Y., Tononi, G. (2010). Dreaming and the brain: from phenomenology to neurophysiology. Trends in Cognitive Sciences.
- Stickgold, R., Hobson, J.A., Fosse, R., Fosse, M. (2001). Sleep, learning, and dreams: off-line memory reprocessing. Science.
- Domhoff, G.W. (2003). The scientific study of dreams: neural networks, cognitive development, and content analysis. American Psychological Association.
- Dresler, M. et al. (2012). Neural correlates of dream lucidity obtained from contrasting lucid versus non-lucid REM sleep: a combined EEG/fMRI case study. Sleep.
- Walker, M. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner.
- Jung, C.G. (1917). Über die Psychologie des Unbewussten. Rascher Verlag.
- Freud, S. (1899). Die Traumdeutung. Franz Deuticke.
- Domhoff, G.W. (1996). Finding Meaning in Dreams: A Quantitative Approach. Plenum Press.
- Bulkeley, K. (2008). Dreaming in the World’s Religions. New York University Press.
