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Dreaming, the mind’s pathway to embarking on subconscious journeys, has long been an essential element in shaping humanity. From ancient Mesopotamia onward, dreams have expanded our understanding of the spirit, body, creativity, and even revolutionized fields such as medicine, religion, and human behavior.
In ancient times, dreams were deeply revered, and understanding them was just as critical as understanding the physical world. Although modern society places little importance on dream interpretation, it's crucial to recognize the profound impact dreams had on early humanity—a legacy that continues to influence our society. From cultural significance to biological impact, dreams have been a fundamental force in the development of humankind, a force that is often overlooked.
10. Healthcare
A widespread belief holds that during sleep, the mind conducts a body scan, and any ailments discovered are represented through projected images known as dreams. Hippocrates, the father of modern medicine, was one of the key figures who popularized this idea. He believed that dreams were omens of diseases forming in the body; by paying attention to these dreams, individuals could prevent illnesses from taking root.
Galen, a prominent ancient physician, also connected medicine with the dream world, focusing on the relationship between temperaments and dreams, which he thought revealed imbalances in the body. Confident in the diagnostic power of dreams, he would often perform surgeries based on dream interpretations. By linking dreams to physical reality and moving away from the notion that illness was caused by superstitions, Hippocrates and Galen played a vital role in establishing medicine as a rational practice, revolutionizing disease treatment.
9. Warfare
Throughout history, many rulers turned to dream interpreters for guidance when making key political and military decisions. Alexander the Great is one such example; a dream led him to conquer the Phoenician city of Tyre. Another is Hannibal, a Carthaginian military commander from the 2nd century B.C., widely regarded as one of the greatest military strategists in history. Hannibal believed his dreams provided prophetic military tactics, reshaping warfare strategies for future generations of leaders.
Genghis Khan, like other rulers, relied heavily on dream interpretation for making critical decisions. In one famous instance, his shaman, Teb Tengri, shared two dreams he had experienced. In the first dream, Genghis Khan was the ruler of the Mongol nation, while in the second, it was his brother, Khasar, who held the reigns of power. Following Teb Tengri’s advice, Genghis Khan swiftly acted and arrested his brother. Fortunately for Khasar, their mother later intervened, convincing Genghis to release him.
8. Faith
A significant unifying theme across the three Abrahamic religions—Judaism, Christianity, and Islam—is the profound belief in dreams as a source of wisdom, guidance, and divine intervention. Dreams have been integral to the origins and growth of these religions. This is evident in the Hebrew Bible, where Abraham, a pivotal figure in the Hebrew tradition, is one of the most frequent dreamers. Similarly, Prophet Muhammad received his first divine revelation through a dream. Both the Torah and the Quran, like the Bible, are filled with references to dreams, underscoring the ancient view of dreams as a medium for sacred messages and revelations.
In ancient Egypt, there was a prevalent belief that the dream state transported the dreamer to a divine realm, where communication with the gods enabled prophetic visions. This process, known as “dream incubation,” involved the dreamer undergoing days of fasting, purification, and ritual practices before entering a temple dedicated to the deity they wished to consult. Once inside, the dreamer would seek divine counsel on both earthly and spiritual matters. Following the dream, interpreters would decode the visions, offering insights about the dreamer's future as revealed by the gods.
7. Literary Influence
Dreams have been a significant theme in literature across various forms, from myths and historical texts to ancient inscriptions. The first recorded dream dictionary, *Oneirocritica*, was written by Artemidorus Daldianus around A.D. 140 in Greece. However, the earliest example of dream interpretation can be found in the Babylonian *Epic of Gilgamesh*, the world’s first documented piece of literature. In this text, dreams are woven into the narrative, symbolizing parts of Gilgamesh's undiscovered identity.
Greek historian Herodotus, often referred to as the father of history, also explored dreams in his writings. In *Histories*, Book One, Herodotus recounts the dream of Lydian King Croesus, who foresees his son’s death from a spear wound. In an attempt to prevent it, Croesus assigns a bodyguard to protect his son during a hunt. Despite this precaution, the son is accidentally speared by the guard. Herodotus also tells of a dream King Astyages had in which his daughter, Mandane, urinates across Asia, flooding the continent. Later, she dreams of giving birth to a vine that casts a shadow over Asia. This dream prophecy is realized when Mandane’s son, Cyrus the Great, overthrows his grandfather, becoming the king of the Persians in the sixth century B.C.
Many other ancient and classical works employed dream interpretation as a form of prophetic literature. Notable examples include Homer’s *Iliad* and *Odyssey*, Aeschylus’s *Oresteia*, Macrobius’s *Commentary on the Dream of Scipio*, Pausanias’s *Description of Greece*, and Pindar’s *Olympian Odes*. In the Middle Ages, writers like Geoffrey Chaucer used dreams as a narrative framework, creating allegorical tales that incorporated personification and symbolism. This tradition laid the groundwork for many dream visions in Romantic literature, further enriching the genre.
6. Psychology
The roots of psychology are intertwined with the study of dreams. Ancient Greek philosopher Aristotle is often regarded as a key figure in shaping the early foundations of psychology. He proposed that dreams reflected the mental state of the dreamer and could offer insights into the subconscious. According to Aristotle, while awake, we can easily distinguish between reality and imagination, but this distinction fades during sleep, making dreams feel vividly real. This led him to conclude that dreams were a product of our experiences, thoughts, and emotions, serving as a way for the mind to confront and resolve mental anxieties.
In his work *Oneirocritica*, Artemidorus categorized dreams into two primary types: direct and allegorical. The allegorical dreams were believed to convey messages from the soul to the mind and body. The focus of both Aristotle and Artemidorus on dream interpretation in relation to psychology laid the groundwork for Sigmund Freud’s psychoanalytic theory, deepening the world’s understanding of the science and nature of dreams like never before.
5. Evolution
While the exact purpose of dreaming remains a subject of ongoing discussion, Finnish philosopher Antti Revonsuo proposed an evolutionary theory that suggests dreams played a role in the survival of early humans by simulating threatening situations. This allowed our ancestors to practice and sharpen their survival instincts in the safety of sleep. Because the brain cannot distinguish between reality and mental images during dreams, these simulated threats provided a survival advantage, enhancing the ability to react to dangers such as predators, environmental hazards, and hunger. This dream-based rehearsal likely played a significant role in developing skills that were crucial for survival and passed down through generations, increasing the chances of reproduction and the transmission of these traits to offspring.
4. Behavior
A study at Carnegie Mellon University examined the impact of dreams on people's real-life actions. After surveying 182 commuters at a Boston train station, the researchers found that people were more likely to adjust their travel plans after dreaming of a plane crash than if they had simply thought about it or received a government warning. This reaction is due to the high activity in the limbic system and amygdala—the regions of the brain responsible for emotional responses—during the rapid eye movement (REM) phase of sleep, leaving dreamers with stronger emotional reactions upon waking.
In the modern age, dreams influence our daily lives on a more subconscious level, whereas for our ancestors, they served as crucial guides in making life decisions and adjusting their activities. The emotional responses evoked by dreams would often carry over into their waking hours. For instance, a positive dream about someone could strengthen their emotional connection with that person, while a negative dream might evoke opposite emotions, potentially straining relationships. As a result, dreams played a significant role in shaping the cultures of early human societies, influencing behavior, social interactions, and even inspiring new ideas.
3. Philosophy
A prevalent idea in philosophy is that what we perceive as the real world could merely be an illusion or a creation of our imagination. This concept was first notably expressed in the ancient Chinese philosopher Zhuang Zhou’s famous dream, “The Butterfly Dream.” In this vision, Zhou becomes a butterfly, unaware of his true identity as Zhou. Upon awakening, he is left in confusion, pondering whether he is truly Zhou, who just dreamed of being a butterfly, or whether he is actually a butterfly now dreaming that he is Zhou. The essence of Zhou’s story is the notion that reality itself may be a dream, and by embracing this idea, one can separate absolute representations from the objects and people we perceive as “real.” Through dreams, our ancestors nurtured a curiosity about existence beyond their physical reality, sparking the birth of philosophy and a quest for the nature of reality.
This notion would later influence the famous phrase coined by 17th-century French philosopher René Descartes: cogito, ergo sum, or “I think, therefore I am.”
2. Memory Strengthening
Some theorists suggest that both humans and animals absorb information throughout the day, which is later replayed during the REM phase of sleep. This process enhances the performance of the hippocampus, the brain area responsible for memory storage. Essentially, the brain utilizes dreams to process and cement newly acquired information into memory.
In the early stages of human culture and evolution, our ancestors constantly gathered new knowledge, ranging from survival tactics to social interactions, ancient technologies, and agricultural practices. But how did these societies and cultures continue to thrive if they couldn’t commit that knowledge to memory? One theory posits that dreaming evolved as a mechanism to support the development of memory. Early human minds were like chaotic file cabinets filled with facts. Through dreams, they were able to organize and store important survival information, such as identifying poisonous berries or remembering the location of the safest cave.
1. Respect And Recognition
In ancient times, dreams were often seen as a pathway to gaining higher respect and recognition. For example, Native American children, as part of their initiation rite, would embark on a vision quest when they reached puberty. Alone in the wilderness, with no food or water for days, these adolescents would fast in isolation until they experienced a dream that revealed their spiritual identity and role within the tribe.
Similarly, in ancient Egypt, the Heb-Sed festival, held every 30 years of a pharaoh's reign, was a test to prove his worthiness to continue ruling. During this ritual, the king was expected to transcend his earthly body, die symbolically in a dream, descend to the Underworld, become Osiris (the god of the afterlife), and return spiritually transformed to the mortal realm.
Additionally, in ancient cultures, shamans—individuals who mediated between their tribe and the spirit world—had to undergo a similar transcendence through a dream before they could be recognized as shamans. Those who received such spiritual visions were revered, as shamans were entrusted with the power to oversee key life events, such as births, vision quests, marriages, and deaths, as well as tasked with studying their tribe's mythology, genealogy, beliefs, and language.
