Daytime Mind Wandering Mirrors Nighttime Dream Bizarreness, Study Finds

A new investigation published in *Consciousness and Cognition* compared the bizarre content of nighttime dreams with that of waking mind-wandering. Using a self-caught design, 21 volunteers recorded one dream and one mind-wandering episode each day over several weeks, yielding 379 audio reports. The analysis revealed that bizarre elements comprised roughly eight percent of dream content and nine percent of mind-wandering content, indicating nearly identical densities.

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Dream bizarreness—events that are unlikely, impossible, or physically implausible—has long been taken as evidence that dreaming is fundamentally detached from waking cognition. Psychologists have debated whether dreaming and mind wandering lie on a fluid spectrum or represent distinct categories. The study was conducted by Manuela Kirberg and Jennifer Windt of Monash University, Australia, who previously argued that cognitive control shapes both states.

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Half of the dream reports contained multiple bizarre elements, versus a third of the mind-wandering reports. The researchers classified bizarreness as incongruity, vagueness or discontinuity. Dreams uniquely showed fused identities and gradual transformations, while discontinuity—abrupt jumps in time or space—appeared twice as often in mind-wandering episodes. Social interactions and actions each made up roughly 20-25 % of the content.

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The similar density of bizarre elements indicates that dreaming and mind wandering share a spontaneous offline simulation mechanism, differing mainly in expression. This challenges models that treat dreams as a separate cognitive domain and supports theories linking reduced cognitive control to increased mental fluidity. Understanding the overlap may clarify how the brain recombines memories into imagined scenarios.

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Kirberg and Windt conclude the two states contain nearly identical concentrations of strange features, but dreams present them in more elaborate, often physically impossible forms. They argue nighttime dreams cannot be dismissed as inherently more bizarre than daytime daydreams, emphasizing a nuanced analytical lens.

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The sample was modest and recordings were made at home without neurophysiological monitoring, limiting insight into sleep-stage contributions. Dream reports tended to be longer than mind-wandering entries, possibly inflating the apparent prevalence of bizarre content. Participants recalled primarily vivid, late-morning dreams, which may not represent the full nocturnal spectrum.

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• “Nighttime dreams cannot simply be dismissed as inherently more bizarre than daytime daydreams.” — Manuela Kirberg, Monash University

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• “The two states just express that strangeness in different ways.” — Jennifer Windt, Monash University

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• “Waking mind wandering is highly fragmented by comparison.” — Manuela Kirberg & Jennifer Windt, Monash University

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• “Future studies could explore how an individual’s age might alter the frequency and strangeness of their unguided thoughts.” — Manuela Kirberg & Jennifer Windt, Monash University

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The authors suggest examining age-related changes in spontaneous thought and employing neuroimaging to link bizarre content with specific sleep stages. Larger, more diverse samples could test the generality of the findings.

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