Dream
In the third millennium BCE, Babylonian scribes recorded dream omens in texts like Iškar Zaqīqu. These documents listed specific scenarios and predicted outcomes for those who experienced them. Ancient Sumerians practiced dream interpretation long before written history began to capture it. King Gudea of Lagash reigned from 2144 to 2124 BCE and rebuilt a temple after receiving instructions in a dream. He was told directly by a deity to construct the temple of Ningirsu. Such visitation dreams featured authoritative figures commanding action rather than passive observation.
Ancient Egyptians believed dreams were the best way to receive divine revelation. They would sleep on special beds called incubation beds within sanctuaries to seek advice or healing from gods. The Greeks shared these beliefs with their Egyptian neighbors regarding how to interpret good and bad dreams. Morpheus, the Greek god of dreams, sent warnings and prophecies to those sleeping at shrines. Early Greek beliefs held that gods physically visited dreamers through keyholes to deliver messages.
The transition from ancient to modern times saw a sharp reduction in the power attributed to post-dream behaviors. Writings from Mesopotamia and Ancient Egypt dictated actions based on dream content. Later millennia shifted focus toward visualized narratives where the dreamer became an active participant. Calvin Hall collected over 50,000 dream reports between the 1940s and 1985 at Western Reserve University. His data showed that only God remained as a residue of antiquity's authoritative figure in his catalog of characters.
Dreaming occurs mainly during rapid-eye movement sleep when brain activity resembles being awake. Scientists cannot specify dream physiology in detail due to restrictions on human brain research. Protocols in most nations limit studies to non-invasive procedures like electroencephalogram voltage averaging. Invasive brain procedures are allowed only for surgical treatment of medical needs within the United States. Functional magnetic resonance imaging signals move too slowly to explain real-time brain computation.
Animal subjects provide some clues but yield no hard facts about dream neurophysiology. The Society for Neuroscience states that much research must be done on animals because adequate alternatives do not exist. Animal dreaming can only be inferred rather than confirmed by direct observation. Examining human subjects with brain lesions offers clues but cannot discriminate between destruction and disconnection effects. Lesion methods fail to target specific neuronal groups in heterogeneous regions like the brain stem.
Pooling study results led to the conclusion that dreaming involves large numbers of regions and pathways. These pathways likely differ for different dream events. Studies detect increased blood flow in specific brain regions and credit those areas with generating dreams. Image creation involves significant neural activity downstream from eye intake. The visual imagery of dreams is produced by activation of structures that generate complex visual imagery in waking perception.
A turning point arrived in 1953 when Science published an Aserinsky and Kleitman paper establishing REM sleep as distinct. Many studies since then have studied measurable REM sleep rather than actual dream phenomena. Hobson and McCarley proposed their activation-synthesis hypothesis in 1977 to promote learning processes. A Harvard study published in 2010 showed experimental evidence linking dreams to improved learning outcomes.
Crick and Mitchison introduced reverse learning theory in 1983 comparing dreams to computer cleaning operations removing junk nodes. Hartmann proposed quasi-therapeutic functions for trauma processing in 1995. Revonsuo developed threat simulation hypothesis in 2000 claiming dreams replicated physical threats for survival advantage. He later added social simulation theory in 2015 describing training for social skills. Eagleman and Vaughn presented defensive activation theory in 2021 focusing on protecting the occipital lobe.
Hindu Mandukya Upanishad texts written before 300 BCE describe dreams as one of three states experienced by the soul. The other two states are waking life and deep sleep without dreaming. Early Upanishads emphasize that dreams express inner desires or show the soul leaving the body until awakening. Jewish Talmud Tractate Berachot discusses interpreting dreams from which lessons can be garnered.
Ancient Hebrews connected dreams heavily
with monotheistic religion believing they were the voice of one God alone. They differentiated between good dreams from God and bad dreams from evil spirits. Prophet Samuel slept in the temple at Shiloh before the Ark to receive the word of the Lord. Joseph interpreted Pharaoh's dream about seven lean cows swallowing seven fat cows predicting seven years of plenty followed by famine.
Christianity shared beliefs with Hebrews regarding supernatural character of dreams found in Old Testament stories. Jacob's ladder stretching from Earth to Heaven remains a famous example of divine communication through sleep. Islam classifies true dreams, false dreams from shaytan, and meaningless everyday dreams called hulm. Aisha reported that the Prophet Muhammad's dreams came true like ocean waves. Constantine the Great started his conversion to Christianity after dreaming he would win the battle of Milvian Bridge.
Austrian neurologist Sigmund Freud founded psychoanalysis in the late 19th century theorizing dreams reflect unconscious mind content. He argued important unconscious desires relate to early childhood memories and experiences shaping dream narratives. Carl Jung expanded on Freud's idea that dream content reflects unconscious desires without necessarily fulfilling them directly.
One study surveyed students in the United States, South Korea, and India finding most believe their dreams
reveal hidden truths. Seventy-four percent of Indians believed dream content provided meaningful insight into unconscious beliefs compared to fifty-six percent of Americans. People attribute more importance to dream content than similar thought content occurring while awake. Participants were more likely to miss flights if they dreamed of crashing than if they simply thought about it.
Psychologists explain these experiences through memory biases involving selective recall for accurate predictions. Multi-faceted nature makes it easy to find connections between dream content and real events. The term veridical dream indicates revelations containing truths not yet known to the dreamer. Experiments using fake diaries showed subjects remembered successful predictions better than unsuccessful ones when asked to recall them later.
In 1975 psychologist Keith Hearne successfully recorded communication from a dreamer experiencing lucid dreaming. On the 12th of April 1975 subject Alan Worsley agreed to move his eyes left and right upon becoming lucid. This task was carried out successfully after establishing eye movement signals as verification methods. Years later psychophysiologist Stephen LaBerge conducted similar work mapping subjective sense of time within dreams.
Dream control has
been reported to improve with practiced deliberate lucid dreaming techniques. Ability to control aspects is not necessary for a dream to qualify as lucid since knowing one is dreaming suffices. Communication between two dreamers has also been documented through EEG monitoring and ocular signaling processes. A coordinating website tracked when both dreamers were dreaming and sent red light stimuli to incorporate into dreams.
One dreamer signaled with eye movements detected by the website whereupon stimulus was sent to second dreamer. This process invoked incorporation into that dreamer's dream creating shared hallucinatory experiences. Studies comparing electrical activity while singing awake versus dreaming reveal distinct patterns in brain function. Research continues exploring how individuals achieve voluntary control during sleep states without external interference.
Common questions
What did Babylonian scribes record about dreams in the third millennium BCE?
Babylonian scribes recorded dream omens in texts like Iškar Zaqīqu that listed specific scenarios and predicted outcomes for those who experienced them. These documents dictated actions based on dream content during ancient times.
When was REM sleep established as distinct from other sleep states by Science journal?
Science published an Aserinsky and Kleitman paper establishing REM sleep as distinct on the 1st of January 1953. Many studies since then have focused on measurable REM sleep rather than actual dream phenomena.
How do Hindu Mandukya Upanishad texts describe dreams written before 300 BCE?
Hindu Mandukya Upanishad texts written before 300 BCE describe dreams as one of three states experienced by the soul alongside waking life and deep sleep without dreaming. Early Upanishads emphasize that dreams express inner desires or show the soul leaving the body until awakening.
Who interpreted Pharaoh's dream about seven lean cows swallowing seven fat cows predicting seven years of plenty followed by famine?
Joseph interpreted Pharaoh's dream about seven lean cows swallowing seven fat cows predicting seven years of plenty followed by famine. Ancient Hebrews connected dreams heavily with monotheistic religion believing they were the voice of one God alone.
On what date did psychologist Keith Hearne successfully record communication from a dreamer experiencing lucid dreaming?
Psychologist Keith Hearne successfully recorded communication from a dreamer experiencing lucid dreaming on the 12th of April 1975. Subject Alan Worsley agreed to move his eyes left and right upon becoming lucid after establishing eye movement signals as verification methods.