Mindscape Collective is now The Consciousness Library. Same library, new name. You may need to sign in again. About the change
Skip to content

Dreaming

Dreams as experience: content, phenomenology, recall, nightmares, and the threshold states at the edges of sleep.

State of the evidence

Synthesized

Synthesized from 25 studies in the library · AI-generated, grounded in the abstracts below

Found by searching the library for Dreaming, dream content, dream recall, nightmare, hypnagogia, oneirology, then ranked by relevance.

Dreaming is a conscious state during sleep that shares phenomenological and neural features with waking mind wandering, yet also exhibits unique characteristics such as bizarreness and reduced meta-awareness. Lucid dreaming, a distinct form where the dreamer knows they are dreaming, is associated with increased prefrontal and parietal connectivity and can be learned, but its therapeutic role in nightmares remains unclear because the active ingredient (lucidity vs. exposure) is not isolated. The evidence is largely consistent across neuroimaging, survey, and case studies, but is limited by small samples, reliance on self-report, and a lack of large-scale controlled trials.

Evidence by study

Direction is which way each study's own result points, not our rating of the study.

What the directions mean
Supports:
the study found the intervention worked, or its hypothesis held.
Opposes:
it found the opposite, no benefit or a harm.
No effect:
no significant difference either way.
Mixed:
effects in both directions within the same study.
Unclear:
the abstract does not report a direction.
Lucid Dreaming: a State of Consciousness with Features of Both Waking and Non-Lucid Dreaming 2009
Supports

Lucid dreaming shows REM-like delta/theta power but higher gamma (40 Hz) power, especially in frontal regions, and coherence patterns similar to waking.

observational Sample size: 6

Dreaming as mind wandering: evidence from functional neuroimaging and first-person content reports. 2013
Supports

Dreaming and mind wandering share phenomenological features and overlapping default mode network activation, with dreaming described as an intensified version of waking mind wandering.

review

Lucid Dreaming Verified by Volitional Communication during Rem Sleep 1981
Supports

Lucid dreaming was verified by volitional eye signals during REM sleep, confirming that lucid dreamers can communicate in real time.

observational Sample size: 5

Lucid Dreaming Treatment for Nightmares: A Pilot Study 2006
Supports

Lucid dreaming treatment reduced nightmare frequency at 12-week follow-up, but lucidity was not necessary for improvement, leaving the active mechanism unclear.

RCT Sample size: 23

Lucid Dreaming as a Learnable Skill: A Case Study 1980
Supports

A mnemonic technique (MILD) increased lucid dreams from <1/month to ~21.5/month, demonstrating that lucid dreaming is learnable.

case study Sample size: 1

Dreaming: a conceptual framework for philosophy of mind and empirical research 2016
Unclear

Provides a conceptual framework for dreaming as conscious experience, integrating philosophy and empirical research, but does not report new data.

theoretical

Lucid Dreaming as a Treatment for Recurrent Nightmares 2010
Supports

Lucid dream induction was effective in alleviating nightmares in all five cases, with 4 of 5 nightmare-free at 1-year follow-up.

case study Sample size: 5

Lucid Dreaming in Narcolepsy 2015
Supports

Narcolepsy patients reported more frequent lucid dreaming (77.4% vs 49.1%) and achieved lucid REM sleep in naps, with lower delta/theta/alpha power during lucid REM.

case-control Sample size: 106

The Experience Elicited by Hallucinogens Presents the Highest Similarity to Dreaming within a Large Database of Psychoactive Substance Reports 2018
Supports

Subjective reports of serotonergic psychedelics (especially LSD) showed the highest semantic similarity to high-lucidity dreams, while deliriants resembled low-lucidity dreams.

observational

The Phenomenology of Lucid Dreaming: An Online Survey 2014
Supports

Among respondents, 83.5% reported lucid dreams; average lucid dream duration was ~14 minutes, and frequency was the strongest predictor of phenomenological features.

observational Sample size: 684

Metacognitive Mechanisms Underlying Lucid Dreaming 2015
Supports

High-lucidity participants had greater gray matter volume in frontopolar cortex (BA9/10) and stronger BOLD signal during thought monitoring, linking lucid dreaming to metacognition.

observational

Frequency of Lucid Dreaming in a Representative German Sample 2011
Supports

51% of participants reported at least one lucid dream; lucid dream recall was higher in women and negatively correlated with age.

observational Sample size: 919

Varieties of Lucid Dreaming Experience 2000
Unclear

Argues that lucid dreaming experience is subject to individual variation due to anatomical, physiological, and psychological factors.

theoretical

Lucid dreaming: an age‐dependent brain dissociation 2012
Supports

Lucid dreaming incidence is high in young children and drops around age 16, with higher incidence in students attending higher-level schools.

observational

Frequent lucid dreaming associated with increased functional connectivity between frontopolar cortex and temporoparietal association areas 2018
Supports

Frequent lucid dreamers showed increased resting-state functional connectivity between left anterior prefrontal cortex and temporoparietal areas, with no structural differences.

case-control Sample size: 28

Targeted dream incubation at sleep onset can influence later dream content in REM sleep: a pilot study 2026
Supports

Targeted dream incubation at sleep onset influenced dream content in subsequent REM sleep, with 50% incorporating the target theme in first REM dream.

observational Sample size: 11

Imagery Training in REM Sleep and Lucid Dreaming and the Optimisation of Motor Memory Consolidation in Athletes: A Narrative Review 2026
Supports

Lucid dreaming may serve as a platform for motor imagery practice during sleep, with preliminary evidence suggesting improved motor memory consolidation in athletes.

review

Dream-like mental states can occur during wakefulness. 2026
Supports

Dream-like mental states (clustered by bizarreness, fluidity, spontaneity, wake perception) occur across wakefulness, N1, and N2 sleep, challenging a strict wake-sleep dichotomy.

observational Sample size: 92

“God of Holy Dreaming”: A Retrospective Appreciation of an Aboriginal Prayer and Spirituality in A Prayer Book for Australia 2026
Unclear

Examines the cultural and spiritual value of dreams in Aboriginal and early Christian traditions, but does not report empirical data on dreaming.

qualitative

Between Sleep and Liberation in Indian Traditions: Lucid Dreaming, Out-of-Body Experiences, and the Architectures of Liminal Consciousness 2026
Unclear

Analyzes lucid dreaming and out-of-body experiences in Indian philosophical traditions as deliberately cultivated liminal states, but does not present new empirical data.

theoretical

Dreaming and mind wandering: Spontaneous thought across the sleep-wake cycle. Editorial introduction 2026
Unclear

Editorial introduction arguing that dreaming and mind wandering are intimately connected and raise important questions for theories of attention, action, and consciousness.

theoretical

The kaleidoscope of bizarreness: The analysis of first-person-reports shows the relationship between dreaming and mind wandering to be complex. 2026
Mixed

Dreaming and mind wandering have unique bizarreness profiles with both similarities and differences; dreams cannot be straightforwardly described as intensified mind wandering.

observational

Are Dreams Narrative Experiences? How Assumptions About Fictional Narratives Shape Debates on Dream Experiences 2025
Unclear

Argues that assumptions about fictional narratives have shaped philosophical debates on dreams, and that dreams may not inherently have a narrative structure.

theoretical

Dreaming as fascinated predictions: bridging Sartre’s phenomenology and predictive processing 2025
Unclear

Integrates Sartre's phenomenology of dreaming with predictive processing, suggesting dreaming is an active predictive process constrained by REM sleep physiology.

theoretical

A beautiful loop: An active inference theory of consciousness. 2025
Unclear

Proposes an active inference theory of consciousness that includes dreaming as a form of world-model simulation, but does not report empirical data.

theoretical

Points of agreement

  • Lucid dreaming is associated with increased prefrontal and parietal cortical activity and connectivity, particularly in frontopolar and temporoparietal regions.
  • Dreaming and waking mind wandering share phenomenological features (e.g., audiovisual content, emotion, loose narrative) and overlapping default mode network activation.
  • Lucid dreaming can be learned or induced through techniques such as MILD, and its prevalence is higher in younger individuals and in clinical populations like narcolepsy.
  • Lucid dreaming treatment appears to reduce nightmare frequency, though the specific mechanism (lucidity vs. exposure) remains unclear.

Conflicts

  • One study (26321) found that lucidity was not necessary for nightmare reduction, while case studies (26322) attribute improvement to lucid dream induction.
  • The relationship between dreaming and mind wandering is debated: some studies (29856) describe dreaming as intensified mind wandering, while another (30871) finds distinct bizarreness profiles that challenge a simple continuum.
  • Neuroimaging evidence for structural differences in frequent lucid dreamers is inconsistent: one study (26417) found no structural differences, while another (26332) reported greater gray matter volume in frontopolar cortex.

Gaps

  • Durability of lucid dreaming treatment effects beyond 12 weeks is not established.
  • Blinding and active control conditions are lacking in nightmare treatment studies.
  • Large-scale, preregistered RCTs on lucid dreaming induction and its therapeutic applications are absent.
  • The neural mechanisms differentiating lucid from non-lucid dreaming, and dreaming from mind wandering, require further investigation with larger samples.
  • Cross-cultural and developmental studies on dreaming phenomenology are limited.
Browse these studies in the library
How we analyze this

This synthesis reads the 15 most-cited and 10 most recent studies whose primary subject is Dreaming, up to 25 in all. The most-cited set anchors the established evidence, and the recent set surfaces work that is too new to have gathered citations yet.

A study qualifies only when Dreaming or a known alias appears in its title or keywords, so broad reviews that mention it only in passing are left out. Each study is read from its abstract, strongest evidence first, and the summary reports the direction of the results along with any conflicts and gaps.

Ask your own question in the Research Synthesis Tool

1,829 articles · 519 from the last two years · 715,284 participants across 727 studies reporting sample size

Common study designs

review 188 observational study 113 observational cohort 238 cross-sectional survey 77 theoretical or philosophical paper 432

Research

Synthesize the evidence → Search all →

Dream and nightmare alterations in patients presenting with suicidal crisis: A prospective study in psychiatric emergency department.

Sleep Medicine October 1, 2026 Emilie Gagneron, Katayoun Rezaei, Romain Perot et al.

In a psychiatric emergency department in Paris, 83% of patients experiencing a suicidal crisis reported at least one dream alteration. Bad dreams occurred in 61.9% of participants, nightmares in 52.4%, and suicidal scenarios within nightmares in 35.7%. Nightmares emerged on average 128 days before the crisis, while suicidal-themed nightmares appeared closer, about 16 days before the emergency visit. Over half of patients (54.8%) showed an evolutionary pattern of at least two successive dream alterations. Nightmare severity correlated with insomnia severity and anxiety symptoms. These findings suggest that nightmares may serve as early markers of suicide risk, with systematic assessment potentially enhancing clinical practice.

DOI: 10.1016/j.sleep.2026.109110 (opens in new tab) Full text (opens in new tab) Dream content Insomnia Nightmares Psychiatric emergency +2

Nightmares and cardiometabolic diseases in an adult population-based sample.

Journal of Psychosomatic Research September 1, 2026 Keyuan Liu, Geoffroy Solelhac, Nicola Andrea Marchi et al.

Frequent nightmares are linked to a higher risk of cardiometabolic diseases such as hypertension and diabetes. In a Swiss general-population study across three follow-ups, people with frequent nightmares had higher body mass index and greater prevalence of hypertension and diabetes than those without nightmares. Ecological momentary assessment confirmed a 2.53-fold higher odds of hypertension in the second follow-up. Polysomnography showed a lower pulse wave amplitude drops index in the frequent nightmare group, suggesting altered autonomic function, but salivary cortisol levels did not differ, indicating the stress hormone pathway alone does not explain the association. The findings suggest nightmares are associated with cardiometabolic risk, though the mechanisms remain unclear.

DOI: 10.1016/j.jpsychores.2026.112867 (opens in new tab) Full text (opens in new tab) Autonomic arousals index Cardiometabolic diseases Ecological momentary assessment Nightmares +1

Lucid Dreaming Frequency Associated With Grey-White Matter Networks: An Exploratory Multimodal MRI Study.

Journal of Sleep Research August 1, 2026 Nicola De Pisapia, Erdem Taskiran, Stefano Mastino et al.

Lucid dreaming—becoming aware that one is dreaming while still in the dream—blends the sensory richness of REM sleep with waking self-awareness. Using a multimodal brain-imaging technique (mCCA + jICA), this exploratory study identified structural brain features linked to how often people naturally have lucid dreams. Lucid-dream frequency was associated with a joint grey-matter and white-matter component spanning frontal, temporal, parietal, and cerebellar regions involved in metacognition, imagery, and volitional control, plus a grey-matter-specific component in visual and attentional areas such as the cuneus. Ordinary dream recall, by contrast, was linked only to two white-matter-specific components, with no overlap. The results indicate that the tendency for lucid dreams depends on distributed, integrated brain systems distinct from those supporting general dream recall.

DOI: 10.1111/jsr.70305 (opens in new tab) Full text (opens in new tab) Dream recall Lucid dreaming Consciousness Mcca + jica +3

Dreaming during anaesthesia: a scoping review.

British Journal of Anaesthesia August 1, 2026 Pilleriin Sikka, Sherry Hu, Boris D. Heifets

Dreaming during anaesthesia is common and has been documented for over a century, but remains poorly understood. This review of 157 studies from 1921 to 2024 involving 87,866 participants found that dream recall rates vary widely, from 3% to 8% in large clinical trials to 40% to 80% in experimental settings. Ketamine and propofol are most consistently associated with recall. Dreams are predominantly pleasant and feature everyday autobiographical content. Dream recall is not linked to intraoperative awareness, challenging the idea that dreams indicate inadequate anaesthetic depth. Higher home dream recall, preoperative suggestion, and immediate post-emergence assessment increase recall rates. Unpleasant dreams reduce willingness to undergo the same anaesthetic again. The positive nature and suggestibility of anaesthesia dreams suggest potential therapeutic uses.

DOI: 10.1016/j.bja.2026.05.002 (opens in new tab) Full text (opens in new tab) Ketamine Phenomenology Anaesthesia dreaming Disconnected consciousness +4

Temporal associations between nightmares and PTSD symptoms in the acute post-sexual assault period: An ecological momentary assessment study

Journal of Mood and Anxiety Disorders July 10, 2026 Ashby Boland, Lauren D Reyes, Jenny Black et al.

Nightmares are common after sexual assault and may contribute to posttraumatic stress disorder (PTSD) development, but daily links between nightmares and PTSD symptoms in the acute aftermath are not well understood. In 54 women sexual assault survivors followed with daily surveys for six weeks, most had clinically significant PTSD symptoms and frequent nightmares (42.8% of days). At the within-person level, nightmares predicted next-survey PTSD symptoms and vice versa, but these effects disappeared after adjusting for how symptoms carried over from one time to the next. Between individuals, those with more frequent nightmares had higher PTSD symptoms, with models accounting for 43-44% of the variance. Short-term nightmare fluctuations may not drive PTSD changes once stability is considered; nightmares may instead indicate overall PTSD severity.

DOI: 10.1016/j.xjmad.2026.100191 (opens in new tab) Ecological validity Ecological study Poison control Disease +4

PHINN-EEG: Topological Time-Series Analysis of Dream-State EEG -- Dynamic Betti Curves for Dream Content Classification and Topology-Conditioned Neural Signal Synthesis

arXiv (Cornell University) July 10, 2026 Ren Takahashi, Emre Yusuf, Jayabrata Bhaduri

A new framework called PHINN-EEG uses topological data analysis to detect dreaming from EEG signals, moving beyond traditional power-spectral methods. By extracting dynamic Betti curves from multichannel EEG epochs via sliding-window embeddings and Vietoris-Rips filtrations, the approach targets an area under the receiver operating characteristic curve (AUC) of 0.82–0.90 on a subset of the DREAM database, compared to the current state-of-the-art AUC of about 0.70. The work also introduces a topology-conditioned flow model for synthesizing dream-state EEG and proposes candidate Betti transition archetypes linking brain topology to dream report categories, pending empirical validation. If confirmed, this could shift neural rare-event detection from spectral energy to phase-space geometry, with implications for wearable brain-computer interface dream monitoring.

DOI: 10.48550/arxiv.2607.09662 (opens in new tab) Artificial neural network Topology electrical circuits Pattern recognition psychology Curse of dimensionality +12

Why dream amnesia may be adaptive: dream recall frequency predicts dream-reality confusion

PsyArXiv Preprints July 10, 2026

Frequent dream recall is associated with a higher likelihood of dream-reality confusion, according to a population-based survey of 4,961 adults. The association remained after controlling for age, sex, and lucid dreaming frequency. Individuals who recalled dreams more often also reported that dream-reality confusion experiences were more personally relevant and disruptive to daily functioning. The authors propose that limiting explicit recall of dream content may help maintain a clear distinction between internally generated and externally experienced events, potentially serving an evolutionary adaptive function by protecting against cognitive disruptions. Longitudinal and experimental studies are needed to determine whether dream amnesia plays a protective causal role.

DOI: osf:ad43f_v1 (opens in new tab) Full text (opens in new tab) Dream recall Lucid dreaming Dream-reality confusion Clinical psychology +5

Am I dreaming, or does it just feel like it?: The impact of induced dissociation on sleep quality and memory consolidation

Open Access at Essex July 9, 2026 Camila Bottger Garcia Godos

Induced dissociative states, created using the Mirror Gazing Task (MGT), affected the consolidation of episodic memory but not autobiographical, procedural, or working memory, nor dreaming. A pilot study with 52 participants compared MGT durations of 10 minutes, 30 minutes, or three 10-minute sessions, finding the 30-minute protocol produced the strongest and longest-lasting dissociative state. A second study with 22 participants used 30 minutes of MGT versus control gazing, measuring memory and dissociative states before MGT, after MGT, and after a night of sleep. Dissociative experiences during dreams were also measured. The findings suggest acute dissociation may selectively impair episodic memory consolidation, informing clinical models of dissociative disorders.

DOI: 10.5526/err-00043536 (opens in new tab) Full text (opens in new tab) Dissociation chemistry Dissociative disorders Working memory Consolidation business +7

Bodily Stimulation During REM Sleep: Effects of Muscle and Vestibular Cueing on Lucid Dreaming

SLEEP Advances July 8, 2026 Emma Peters, Xinlin Wang, Johanna Heitmann et al.

Targeted bodily stimulation during REM sleep can affect dream lucidity, but the effects depend on the type of stimulation. Electrical muscle stimulation did not increase lucid awareness, whereas galvanic vestibular stimulation was associated with higher lucidity ratings and questionnaire scores, even though the stimulation was rarely incorporated into dream content directly. The findings suggest that modulating the sense of bodily self during REM sleep may enhance reflective awareness without requiring sensory incorporation into dreams. Non-invasive vestibular stimulation may offer a new way to study lucid dreaming mechanisms.

DOI: 10.1093/sleepadvances/zpag074 (opens in new tab) Lucid dream Galvanic vestibular stimulation Vestibular system Somatosensory system +9

Is a fear of death keeping you awake at night? Death anxiety predicts insomnia through nightmare severity

Death Studies July 2, 2026 Rachel E. Menzies, Jessie Brown, Mitchell Turner et al.

Fear of death (death anxiety) is linked to disrupted sleep, but little research has examined its connection to insomnia and nightmares. In an online survey of 515 adults (70% female, 89% in Australia), higher death anxiety was associated with more severe insomnia. Attachment style did not significantly influence this relationship. Nightmare severity acted as a mediator, meaning death anxiety may contribute to insomnia partly through increasing nightmares. The findings suggest that addressing death anxiety could be a useful target for insomnia interventions.

DOI: 10.1080/07481187.2026.2693544 (opens in new tab) Nightmare Anxiety disorder Insomnia Death anxiety +6

Clinical trials

All Dreaming trials →