Lucid dreaming, the ability to realize you’re dreaming while still asleep, remains one of the most intriguing and least understood features of the human mind. Scientists still do not fully understand why some people can effortlessly steer their dreams while others remain passive observers.
Now, a new study suggests the answer may lie in an unusual neurological trait known as synesthesia.
In research published in Frontiers in Psychology, scientists found that certain types of synesthesia, a condition in which senses blend, such as “seeing” colors when hearing sounds, are strongly associated with more vivid, controllable, and emotionally rich lucid dreams.
“We interpret perceptual synesthesia as an expression of excessive counterfactual-richness that enhances perceptual presence and sensorimotor contingencies during dreaming,” researchers write. “These findings both clarify qualitative differences within synesthetic experience and suggest a new direction for understanding synesthesia and lucid dreaming as interconnected cognitive phenomena.”
A Shared Language Between Waking Perception and Dreams
Synesthesia is a rare and somewhat mysterious perceptual phenomenon. People with the condition might associate numbers with personalities, sounds with colors, or time with spatial layouts. While unusual, these experiences are remarkably consistent for individuals and often persist throughout life.
Lucid dreaming, on the other hand, involves a different kind of altered perception. One in which dreamers become aware they are dreaming and, in some cases, can actively manipulate the dream environment.
In this recent study, researchers sought to determine whether these two seemingly distinct experiences share a common cognitive foundation.
“Given that synesthesia involves interactions between multiple sensory modalities, it has been compared to crossmodal correspondences and sound symbolism,” researchers explain. “Both synesthesia and lucid dreams share the vivid perception of sensations or situations that are not actually present.”
Researchers connect the two phenomena through a concept known as “perceptual presence.” This refers to the sense that what you are experiencing is real. They also point to a related concept called “counterfactual richness,” which describes how the brain simulates possible interactions with the world in great detail.
Not All Synesthesia Is Equal
To test their hypothesis, researchers surveyed more than 600 participants and analyzed different types of synesthesia alongside detailed measures of lucid dreaming.
They found that not all forms of synesthesia influence dreaming in the same way. Instead, the study identifies two broad categories of synesthesia that appear to have distinct relationships with lucid dreaming.
One is perceptual synesthesia, which includes experiences such as seeing colors in response to sounds or visualizing sequences in space. The other is conceptual synesthesia, which includes associations such as linking numbers or letters with colors or personalities. That distinction proved critical.
Participants with perceptual synesthesia, particularly those who experienced “visualized sensations” or spatial sequences, showed significantly stronger lucid dreaming abilities. These individuals reported greater dream control, clearer awareness that they were dreaming, and more vivid and emotionally positive dream experiences.
By contrast, those with conceptual synesthesia showed weaker, or even negative, associations with lucid dreaming, especially when personality traits were taken into account.
Why Some Brains Are Better at Dream Control
So why would certain forms of synesthesia make someone better at controlling their dreams? Researchers suggest the answer may lie in how the brain simulates reality.
Perceptual synesthesia appears to enhance what researchers call “counterfactual richness”—the brain’s ability to imagine how sensory experiences could change with different actions. In waking life, this might mean effortlessly visualizing how a sound could transform into color or shape.
In dreams, that same mechanism could translate into a powerful ability to manipulate the dream environment. Researchers propose that this heightened sensory flexibility makes dream worlds feel more real and more responsive to conscious control.
“Regression analyses revealed type-specific effects on lucid dreaming: perceptual synesthesia (Visualized sensation, Spatial Sequence) robustly promoted lucid-dream facets–especially control, and also insight, dissociation, and positive emotion,” researchers write.
In other words, people whose brains naturally generate richer, more dynamic sensory experiences while awake may carry that advantage into their dreams.
The study also found that personality traits influence how synesthesia and lucid dreaming interact.
Traits such as extraversion and openness to experience, both linked to curiosity and cognitive flexibility, were associated with higher overall lucid dreaming.
However, these traits didn’t act uniformly. In some cases, they amplified the benefits of perceptual synesthesia. In others, particularly with conceptual synesthesia, they appeared to dampen lucid dreaming effects.
This suggests that lucid dreaming isn’t driven by a single factor, but rather emerges from a complex interplay between perception, personality, and cognition.
A Continuum of Conscious Experience
Beyond its specific findings, the study challenges the idea that synesthesia is merely an unusual perceptual quirk. Instead, the researchers suggest it may be part of a broader pattern of cognition that connects waking perception with the strange but structured mental experiences that unfold in dreams.
By linking synesthesia to lucid dreaming, the study supports the “continuity hypothesis”: the idea that dreams are not separate from waking life but rather an extension of the same mental processes.
In this view, the way your brain processes the world while awake directly shapes how it constructs dream environments at night.
Despite its intriguing findings, the study comes with important caveats.
Researchers note that the findings are based on self-reported data, meaning participants described their own synesthetic experiences and dream activity rather than undergoing objective testing. While this approach enabled analysis of a large sample, it may also have inflated estimates of synesthesia’s prevalence.
Additionally, the study cannot determine causation. It’s unclear whether synesthesia enhances lucid dreaming, whether frequent dreamers are more likely to report synesthetic experiences, or whether both are driven by a third factor—such as vivid mental imagery.
Nevertheless, the results offer a compelling framework for future research.
Rewriting the Science of Dreaming
Ultimately, the study suggests that lucid dreaming may not be a rare gift reserved for a lucky few, but rather the natural outcome of certain cognitive traits.
If confirmed, the findings could reshape how scientists understand consciousness itself, blurring the line between waking perception and dreaming imagination.
They also raise the intriguing possibility that training the brain to enhance sensory richness through visualization, meditation, or other techniques might one day make lucid dreaming more accessible.
For now, the research suggests that the same brain processes shaping how you perceive the world while awake may also be quietly constructing the one you experience each night.
“The findings of the current study suggest the possibility of a continuous influence of synesthetic perceptual experiences extending into dream experiences, particularly lucid dreaming,” researchers conclude. “Conceptualizing synesthetic sensory-perceptual processing in daily life as potentially continuous with dream experiences may provide a more comprehensive and phenomenological account of the relationship between synesthesia and lucid dreaming.”
Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan. Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com