The short answer
Dream interpretation is not prediction and not diagnosis. This article separates what sleep research observes from what popular interpretation associates with the theme.
Dreaming about flies does not announce illness, gossip or bad luck. Flies appear in dreams linked to small, persistent annoyances, like a task that never ends, a noise, an irritating person or worries that keep coming back. It is also common after hot days when flies were actually around.
Read also: Dreaming about cockroaches and Dreaming about ants.
What research observes
Under the continuity hypothesis, what we see and hear during the day makes its way into dreams. The real buzzing of an insect in the room can even be woven into the scene while you sleep, just like other stimuli from the environment.
Insects in large numbers, like flies over food, tend to come with disgust, a protective emotion linked to dirt and contamination.
Source: Schredl and Hofmann, Consciousness and Cognition, 2003.
The most reported variations
| Scene | What it usually comes with |
|---|---|
| A fly buzzing in your ear | Persistent irritation, something you cannot stop thinking about |
| Lots of flies over food | Disgust, a sense of something spoiled |
| Not being able to shoo the fly | Frustration, an annoyance that will not go away |
| Killing the fly | Relief, sorting out something pending |
| A fly in your mouth or on your body | Intense disgust, discomfort |
Other insects in dreams appear in dreaming about cockroaches and dreaming about ants.
When to seek help
Dreaming about flies is common and harmless. If it turns into a recurring nightmare and you wake up frightened several times a week, it is worth talking to a health professional: see how to have fewer nightmares.
Source: Morgenthaler et al., Journal of Clinical Sleep Medicine, 2018.
What dream books say
Livro do Sonho, a popular Brazilian dream dictionary, links catching a fly to a very good sign, tied to a happy marriage, and killing a fly to luck in business. In folk tradition, flies are also tied to gossip and annoying people nearby.
Freud described dream books as a kind of dictionary that translates each image into another with a fixed meaning. Artemidorus of Daldis, author of the oldest dream interpretation book that has survived, advised looking at the dreamer's life before interpreting. If you see the dream as a message, both paths suggest the same thing: ask what this image brings to mind in your life right now. See dream meanings according to science and culture.
Source: Livro do Sonho, Brazilian dream dictionary; Freud, Die Traumdeutung, 1900.
What folklore says
In folk readings, flies are linked to gossip, envy and annoying people nearby, and a swarm of flies to piled-up problems. These are cultural readings from the dream tradition, worth using for personal reflection rather than as a guarantee of what will happen. See dream meanings according to science and culture.
Sources
- Schredl M, Hofmann F. Continuity between waking activities and dream activities. Consciousness and Cognition, 2003. https://doi.org/10.1016/S1053-8100(02)00072-7
- Dement W, Wolpert EA. The relation of eye movements, body motility, and external stimuli to dream content. Journal of Experimental Psychology, 1958. https://doi.org/10.1037/h0048908
- Morgenthaler TI et al. Position Paper for the Treatment of Nightmare Disorder in Adults: An American Academy of Sleep Medicine Position Paper. Journal of Clinical Sleep Medicine, 2018. https://doi.org/10.5664/jcsm.7178
- Freud S. The Interpretation of Dreams (Die Traumdeutung), 1900. Project Gutenberg. https://www.gutenberg.org/ebooks/66048
- Livro do Sonho. Sonhar com mosca. https://www.livrodosonho.com/significado-dos-sonhos-sonhar-com-mosca-1714.htm
Frequently asked questions
Is dreaming about flies a sign of gossip?
It is a reading from the dream tradition; it works as reflection, not as a guaranteed prediction. The dream usually reflects small annoyances.
What does dreaming about lots of flies mean?
It usually reflects piled-up irritations or disgust at something.
Is dreaming that I kill a fly good?
It usually comes with relief. It is not a guaranteed prediction.
Can a fly buzzing in my room turn into a dream?
It can. Sounds from the environment sometimes slip into dream plots.
