Last updated
Dreams about snakes: what psychology and biology say
Snakes are one of the standard themes on the questionnaire researchers use to study typical dreams3. Animals of all kinds appear in about 18 percent of recent dreams, though dogs, horses and cats are far more common than snakes1. The strongest research thread is biological: humans and other primates seem primed to notice and fear snakes5,6. No study shows that a snake dream has one fixed meaning or predicts anything.
How often do snakes appear in dreams?
Snakes are listed by name among the 55 themes of the Typical Dreams Questionnaire, next to being chased, falling and losing teeth3. When Tore Nielsen and colleagues analysed answers from 1,181 Canadian students, the themes grouped into 16 factors, and women loaded mainly on negative factors, one of which combined snakes and insects2.
Large dream collections put snakes in context. In the UK Library Study, Michael Schredl and Mark Blagrove gathered 2,716 most recent dreams from 4,849 people aged 6 to 90. Animals appeared in 18.30 percent of the dreams, more often in children's than in adolescents' and adults' dreams. The most frequent animals were dogs, horses and cats, about 20 percent of dream animals were the dreamer's own pets, and about 30 percent had bizarre features: they changed into people or other animals, were bigger than in life, or could talk. The authors concluded that animal dreams reflect waking experience but also waking emotions in a metaphorical and dramatised way1. A snake that speaks or grows to the size of a train is ordinary dream behaviour.
Why do people dream about snakes?
The best-supported answer starts with fear. Arne Öhman and Susan Mineka reviewed evidence that intense fear of snakes is common in both humans and other primates, and that humans and monkeys learn to fear snakes more easily than most other things, whether by a bad experience of their own or by watching others react5. In laboratory studies the fear can be triggered and even conditioned when a snake picture is masked so briefly that people do not consciously see it, and snakes automatically capture attention in complex visual scenes5. Öhman and Mineka describe this as an evolved fear module: activated automatically by stimuli that were dangerous in our evolutionary past, relatively hard to control with reasoning, and centred on the amygdala4.
The anthropologist Lynne Isbell went further. Her snake detection theory proposes that snakes were likely the first predators of early mammals and that the long arms race with them, especially with venomous snakes, shaped the visual systems of primates, which evolved to spot a snake before it strikes6. A later study found neurons in the monkey pulvinar, a part of the visual brain, that respond selectively to images of snakes, more strongly and faster than to monkey faces, monkey hands or geometric shapes7. If the waking brain is this tuned to snakes, it is not surprising that the dreaming brain reaches for them when it builds a scene of threat. That link to dreams is an inference; no study has measured it directly.
| Research | What it found |
|---|---|
| Öhman and Mineka, 2001 and 2003{4,5} | Snake fear is learned easily, works without conscious perception and grabs attention |
| Isbell, 2006{6} | Snakes as early predators shaped primate vision |
| Van Le and colleagues, 2013{7} | Monkey pulvinar neurons respond fastest and most strongly to snakes |
| Schredl and Blagrove, 2021{1} | Animals in 18.30 percent of 2,716 dreams, snakes far from the most common |
Experience also matters. Nielsen pointed to seeing snakes as a dream theme whose real-life counterpart has become less accessible to more recent generations, which makes snakes a useful test of how much dreams draw on what we live through and how much on older predispositions3. For most city dwellers today, the snakes in dreams come from films, documentaries, stories and the zoo far more than from the garden.
What does a snake mean in a dream?
Readings of the snake are older than psychology. Many people hear that a snake in a dream stands for an enemy, a hidden danger or, because snakes shed their skin, renewal. Freud listed the snake as "the famous symbol" among male sexual symbols8. The guide to Jungian archetypes in dreams explains how the Jungian tradition works with figures that feel larger than life. None of these readings has research behind it as a fixed meaning, and the pillar on dream interpretation sets out where symbolic, Jungian and cognitive approaches each stand on the evidence.
What tends to help is looking at your snake. Was it still, coiled, watching you, or did it strike? Were you afraid, curious or calm? Was it in your house, your bed, the grass? A snake that bites you feels very different from one you hold without fear. The feeling and the setting usually point more clearly to something in your life than the animal does: a person you do not trust, a situation that could turn on you, or a change you sense is coming. A dictionary gives everyone the same answer, which is why a dream journal works better than a dream dictionary for figures like this.
When snake dreams become a problem
If a snake keeps chasing you through your dreams, the page on being chased covers what research says about that theme. If snake nightmares wake you often or make you dread sleep, talk to a doctor or therapist; the guide on nightmares and imagery rehearsal therapy explains the best-tested treatment. And if your fear of snakes is strong enough during the day that you avoid parks, gardens or even pictures, that is a specific fear a psychologist can help with.
Common questions
What does it mean when you dream about snakes?
No study has shown a fixed meaning. Research suggests humans are primed to notice and fear snakes, so the dreaming brain may use them for threat4,5. Folk readings link snakes to enemies or renewal, and Freud read them as sexual symbols8. What the snake did and how you felt usually says more about your situation than the snake itself.
Why do I keep dreaming about snakes?
Some people notice a snake dream returning in weeks when something feels threatening or untrustworthy, though no study has tested this for snakes specifically. Snakes may also appear after you have seen them in a film or on a walk. Writing down each dream with the date and what happened that day is the most reliable way to see your own pattern.
Are snake dreams common?
Snakes are one of the standard themes on the questionnaire used to study typical dreams3. Among animals, though, they are not the most frequent: in 2,716 recent dreams from a UK study, animals appeared in 18.30 percent, and dogs, horses and cats led the list1. Children dream about animals more often than adults do1.
Why are humans so afraid of snakes?
Research points to evolution. Humans and monkeys learn snake fear more easily than most other fears, the fear can be triggered by pictures people do not consciously see, and snakes automatically capture attention5. The snake detection theory proposes that snakes, as early predators, shaped primate vision6, and monkey brain cells have been found that respond fastest to snakes7.
Is a snake bite in a dream a bad sign?
No research shows that a dream of being bitten predicts illness, betrayal or misfortune. A bite is the point where a threat reaches you, so it often comes with a strong jolt of fear and may wake you. It can be useful to ask what in your life feels as if it could hurt you, and whether you can see it coming.
theDreamly lets you speak or type a snake dream as soon as you wake, while the details are fresh, and keeps it alongside your other dreams so you can see when the figure returns.
Download on the App StoreRead next
- Dream interpretation: what psychology actually knows
- Jungian archetypes in dreams: the shadow, the anima and animus, the threshold
- Dreams of being chased: what research has found
- Dream journal or dream dictionary?
Sources
- Schredl M, Blagrove M (2021). Animals in dreams of children, adolescents, and adults: the UK Library Study. Imagination, Cognition and Personality, 41(1), 87-104. doi.org/10.1177/0276236620960634
- Nielsen TA, Zadra AL, Simard V, Saucier S, Stenstrom P, Smith C, Kuiken D (2003). The typical dreams of Canadian university students. Dreaming, 13(4), 211-235. doi.org/10.1023/B:DREM.0000003144.40929.0b
- Nielsen T (2012). Variations in dream recall frequency and dream theme diversity by age and sex. Frontiers in Neurology, 3, 106. doi.org/10.3389/fneur.2012.00106
- Öhman A, Mineka S (2001). Fears, phobias, and preparedness: toward an evolved module of fear and fear learning. Psychological Review, 108(3), 483-522. doi.org/10.1037/0033-295X.108.3.483
- Öhman A, Mineka S (2003). The malicious serpent: snakes as a prototypical stimulus for an evolved module of fear. Current Directions in Psychological Science, 12(1), 5-9. doi.org/10.1111/1467-8721.01211
- Isbell LA (2006). Snakes as agents of evolutionary change in primate brains. Journal of Human Evolution, 51(1), 1-35. doi.org/10.1016/j.jhevol.2005.12.012
- Van Le Q, Isbell LA, Matsumoto J, Nguyen M, Hori E, Maior RS, Tomaz C, Tran AH, Ono T, Nishijo H (2013). Pulvinar neurons reveal neurobiological evidence of past selection for rapid detection of snakes. PNAS, 110(47), 19000-19005. doi.org/10.1073/pnas.1312648110
- Freud S (1920). A General Introduction to Psychoanalysis, Tenth Lecture: Symbolism in the Dream, trans. G. Stanley Hall. New York: Boni and Liveright. www.gutenberg.org/ebooks/38219