Famous dreams in history — from Kekulé to Lincoln
Some of history's most important discoveries and decisions began in a dream. Here are the most fascinating documented cases, and what they can teach us.
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People have listened to their dreams since the beginning of civilization. But it’s only in the last 200 years that we’ve had documented cases where a dream can be traced directly to a scientific discovery, a creative work, or a historic decision. Some of these stories are extraordinary.
Friedrich August Kekulé and the benzene ring (1865)
Kekulé, the German chemist, had long searched for the structure of benzene — a six-carbon molecule with properties that didn’t fit the linear carbon-chain structures he knew. The solution came in a dream.
Kekulé described it himself in a lecture in 1890: he dreamed of atoms dancing and twisting, and suddenly one formed a snake biting its own tail — the ouroboros, the ancient symbol of cyclicality. Kekulé woke with the insight: benzene isn’t a chain, it’s a ring.
Benzene’s cyclic structure was one of the most important breakthroughs in organic chemistry and laid the foundation for the modern chemical industry. It came from a dream about a snake.
Abraham Lincoln and the dream of his own funeral (1865)
A few days before his assassination on April 14, 1865, Lincoln described a dream to his wife Mary and his friend Ward Hill Lamon:
He was wandering through the White House and heard crying voices. He followed the sounds to the East Room — and there lay a corpse on a catafalque, surrounded by soldiers and mourners. He asked who had died. A soldier answered: “The president. He was killed by an assassin.”
Lincoln was shot twelve days after this dream.
The dream’s authenticity is well documented — Lamon wrote it down shortly after hearing it. Whether it was prophetic in a strict sense, or a processing of Lincoln’s real concerns for his own safety (he received hundreds of death threats), is impossible to determine.
Paul McCartney and “Yesterday” (1965)
McCartney has told the story many times: he woke up one morning with a complete melody in his head. He went to the piano to check that he wasn’t simply remembering something he’d heard — but the melody was new.
Afraid he’d forget it, he played it immediately and recorded it. The lyrics were originally just nonsense words (“scrambled eggs, oh my baby, how I love your legs”). The melody became “Yesterday” — according to Guinness World Records, the most-covered song in history, with over 2,200 recorded versions.
McCartney’s dream is perhaps the most famous example of creative output during sleep turning into a finished, concrete work.
Otto Loewi and the nerve-signal experiment (1921)
Otto Loewi, the Austrian-German pharmacologist, had wondered for years whether nerve impulses were electrical or chemical. One night in 1921, he dreamed of an experiment that could settle the question.
He woke up, jotted down the experiment, and fell back asleep. In the morning, he couldn’t read his own notes. The next night the dream came again — and this time he ran straight to the laboratory.
The experiment — in which he transferred fluid from a frog’s heart stimulated by the vagus nerve to a second heart and observed that the second heart also slowed down — proved that nerve impulses are chemical, not electrical. It’s the foundation of modern neurobiology.
Loewi received the Nobel Prize in Physiology or Medicine in 1936 for this discovery. In his Nobel lecture, he credited the dream.
Dmitri Mendeleev and the periodic table (1869)
Mendeleev worked intensely on organizing the elements by atomic weight and properties. By his own account, the solution came in a dream in which he saw a table where all the elements fell into place.
He woke up and wrote down the table immediately — and found only one error when he checked it.
The periodic table is chemistry’s most fundamental organizing principle. There’s no way to verify that the solution truly came in sleep — but it’s consistent with what we know about the brain’s ability to reorganize complex information during REM sleep.
Srinivasa Ramanujan and mathematics from the goddess (early 1900s)
The Indian mathematician Ramanujan — who had almost no formal training in advanced mathematics, having left college without a degree after failing his non-mathematical subjects — produced thousands of extraordinary formulas and theorems. He attributed many of them to visits from the Hindu goddess Namagiri in his dreams, who, he said, “wrote formulas on his tongue.”
The mathematicians who later examined Ramanujan’s work — including G. H. Hardy, who collaborated with him — confirmed that the formulas were correct and exceptionally deep. Many are still not formally proven, but have been verified empirically.
Ramanujan was either in contact with something we don’t understand, or his brain processed mathematical patterns during sleep in a way that isn’t fully explained.
What these stories tell us
It’s tempting to dismiss these stories as myths or after-the-fact rationalizing. Some of them probably are. But some are well documented and raise genuine questions about what the brain does during sleep.
What we know from neuroscience is that sleep — REM sleep in particular — is a time when the brain reorganizes and connects information across categories it wouldn’t connect while awake and rational. The prefrontal cortex — the logical gatekeeper — is dialed down. Associations that would otherwise be dismissed as illogical are allowed through.
For a brain already loaded with an unsolved problem, that’s the perfect environment for unexpected connections. Creativity research calls this “incubation” — letting a problem sit and letting the subconscious work on it. See the guide on prophetic dreams for more on what research says about dreams that seem to foresee the future.
Dreams may not be magic. But they aren’t empty, either.
What history’s dreamers have in common
History’s most documented dream scenarios are fascinating and instructive:
- Kekulé dreamed the benzene ring as a snake — the foundation of modern organic chemistry
- Lincoln described his own funeral twelve days before his assassination
- McCartney dreamed the complete melody for “Yesterday” and recorded it on waking
- Loewi dreamed the experiment that proved chemical nerve impulses — Nobel Prize in 1936
- Mendeleev saw the periodic table in his sleep and wrote it down immediately
- Shared neurological explanation: REM sleep allows unexpected associations that the rational brain would otherwise reject
Sources and further reading
- Hektoen International — “Scientific discoveries in dreams: Sleeping while the mind works”
- Bulletin for the History of Chemistry (Rocke, 2015) — “It Began with a Daydream: The 150th Anniversary of the Kekulé Benzene Structure”
- Dreaming (Strunz, 1993) — “What Do We Really Know About Mendeleev’s Dream of the Periodic Table? A Note on Dreams of Scientific Problem Solving”
- Linda Hall Library — “Otto Loewi — Scientist of the Day”
