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38 papers in the library · 260 citations · publishing 2009-2026

Papers

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Walking Meditation and Slow Marches: Buddhist Responses to Climate Change Protest

University Library Heidelberg April 28, 2026 Rolf Scheuermann

The climate crisis is arguably one of today’s greatest challenges and the Buddhist doctrine offers a foundation for a comprehensive approach to environmental activism, grounded in core principles such as mindfulness, compassion, and dependent origination (pratītyasamutpāda). Consequently, many Buddhists have turned to environmental activism, trying to find their own ways of expression. This...

Revisiting auditory-triggered reality checks in lucid dream induction: A sleep laboratory study

University Library Heidelberg March 10, 2026 Xinlin Wang, Johanna Heitmann, Lorenzo de Neri et al.

Lucid dreaming refers to a dream state in which the dreamers are aware that they are dreaming and may be able to intentionally influence the dream content. Previous studies have shown that lucid dreaming provides a useful model for investigating cognitive processes during dreaming and may also have potential therapeutic applications. However, reliable methods for inducing lucid dreams are still...

DOI: 10.11588/ijodr.2026.1.115408 (opens in new tab) Lucid dream Cognition Task project management Mental state +2

Effects of dreams on daytime mood: Socio-demographic and personality factors

University Library Heidelberg January 26, 2026 Michael Schredl, Anja S. Göritz

The continuity hypothesis of dreaming states that dreams reflect waking life, however, research has also shown that dreams can affect waking life, e.g., creativity, daytime mood. So far, factors that are associated with the effect of dreams on waking life have been rarely studied. Overall, 2492 persons (1437 woman, 1055 men) with a mean age of 47.75 ± 14.41 years participated in the study. The...

DOI: 10.11588/ijodr.2026.1.114974 (opens in new tab) Nightmare Dream Affect linguistics Consciousness +8

Nighttime Comedy: The associations among funny dreams, various aspects of humor and dream characteristics

University Library Heidelberg January 23, 2026 Dainora Kizytė, Tadas Stumbrys

While the parallels between humor and dreams were already noted by Sigmund Freud over a century ago, funny dreams remain largely overlooked in contemporary research. The present study aimed to assess the associations between funny dreams, various facets of humor, and dream characteristics, while also exploring how humor is expressed within the dream state. Data from 198 survey respondents...

Phenomenology of lucid dreaming, sleep paralysis, and false awakenings: Encounters with the Self

University Library Heidelberg December 29, 2025 Reean Jyka Purisima Corral

Lucid dreaming (LD), sleep paralysis (SP), and false awakenings (FA) are liminal sleep phenomena that are often studied independently, despite evidence suggesting that they may arise from overlapping states of consciousness. Within Filipino cultural contexts, such experiences are frequently interpreted through folklore and superstition, such as bangungot, rather than through scientific or...

DOI: 10.11588/ijodr.2026.1.114820 (opens in new tab) Lucid dream Phenomenology philosophy Liminality Sleep paralysis +10

Can dream content indicate temporal aspects of dreaming?

University Library Heidelberg November 26, 2025 Bshar Samir Bdoor

In this essay, dream reports of the author’s dream diary were probed for their temporal aspects regarding dream production and experience. Three different general inferences were drawn from the dream contents: (a) Dreams are produced and experienced in real-time. (b) Dreams are produced in advance, saved and experienced later. (c) Dreaming is constant, being aware of it is variable. There was...

DOI: 10.11588/ijodr.2026.1.114309 (opens in new tab) Lucid dream Content measure theory Resolution logic Psychoanalysis

Retest reliabilities for two single items measuring bad dream frequency (Pittsburgh Sleep Quality Index (PSQI)) or nightmare frequency (Mannheim Dream Questionnaire (MADRE))

University Library Heidelberg October 21, 2025 Michael Schredl

Several measures eliciting nightmare frequency have been developed over the years. Most of the measures show sufficient reliability, but some studies are based on the four-point item of the Pittsburgh Sleep Quality Index (PSQI) measuring bad dream frequency – even though reliability data for this item have not been published. The present study included a sample of N = 277 participants...

Lucid dreaming in fiction writing: An 8-week experiment

University Library Heidelberg August 13, 2025 Laura Roklicer

This study examined how lucid dreaming (LD) can be used for fiction writing during an 8-week intervention with 29 writers of varied LD experience. Participants received LD induction training and drew on lucid, non-lucid, and hypnagogic/hypnopompic dreams to produce a short story. Quantitative analysis compared blind ratings of pre- and post-intervention short stories across five creativity...

Disturbing dreams, nightmares, and psychological distress are predictors of poor sleep quality.

University Library Heidelberg April 1, 2025 Ian C. Dunican, Hailey Meaklim, Mitchell Turner et al.

Objective: Up to 40% of adults report poor sleep quality, yet research investigating the role of nightmares on sleep quality is limited. This study aimed to characterise the prevalence of disturbing dreams and nightmares and their relationship to poor sleep quality. Method: 439 adults (310 females, Mage=44.9 years) completed an online survey investigating sleep, dreams, nightmares, and mental...

An Investigation of Lucid Dreaming and Dream Yoga for Mental Health

University Library Heidelberg December 14, 2024 Ayush Srivastava

In this paper, I will explore the Tibetan Buddhist practice of dream yoga as a means of improving mental well-being through lucid dreaming. It discusses the psychological and spiritual benefits, including emotional regulation, reduced nightmares, enhanced creativity, and some difficulties with maintaining lucidity and cultural considerations involved. Key questions addressed include- ‘In what...

Does global warming affect dream content? Analyzing a 30-yr. dream series

University Library Heidelberg January 14, 2021 Michael Schredl

The continuity hypothesis of dreaming postulates that dreams reflect waking life, e.g. preoccupations, experiences, thoughts; however, other topics like seasonal changes have been studied very rarely. A long dream series recorded between 1984 and 2015 (over 30 years) including 11,808 dreams showed that “cold” elements like snow, ice, and hail occurred less often over time and, thus, indicates...

DOI: 10.11588/ijodr.2021.1.78020 (opens in new tab) Dream Content measure theory Snow Affect linguistics +4

Adolescents’ dreams under Covid-19 isolation

University Library Heidelberg July 3, 2020 Santa Parrello, Massimiliano Sommantico, Marina Lacatena et al. 18 citations

Based on the continuity hypothesis of dreaming, we have studied the effects of quarantine/isolation on the dreams of Italian adolescents during the time of the Covid-19 pandemic. A sample of 235 subjects (73.2% girls; ages 12-18 years, M = 16.08, SD = 1.7) was involved. Participants were asked to complete the MADRE Questionnaire, as well as to report their Most Recent Dream by responding to...

DOI: 10.11588/ijodr.2021.1.73858 (opens in new tab) Dream Isolation microbiology 2019-20 coronavirus outbreak Content measure theory +6

Dream recall frequency: Stability and changes assessed in a longitudinal design

University Library Heidelberg May 30, 2020 Michael Schredl, Maria Gilles, Isabell Wolf et al. 2 citations

Dream recall frequencies exhibit large inter-individual differences, ranging from recalling a dream almost every morning to recalling a dream almost never. Although dream recall has been conceptualized as a stable trait, longitudinal studies in this area are scarce. Within the framework of a complex study, 279 women (mean age: 31.76 ± 4.73 yrs.) completed a brief sleep questionnaire three times...

An effective lucid dreaming method by inducing hypnopompic hallucinations

University Library Heidelberg February 23, 2020 Michael Raduga 5 citations

Most people experience lucid dreams (LDs), which are dreams in which the dreamer is conscious and able to perceive vivid perceptions. There are many ways to induce LDs, but their levels of efficiency are far from satisfactory. In this study, we analyze the efficiency of an LD method that was tested in commercial events with hundreds of groups over 12 years. The main feature of the method is...

DOI: 10.11588/ijodr.2021.1.71170 (opens in new tab) Lucid dream Plot graphics Perception Cognitive psychology +3

Nightmare distress, nightmare frequency, and beliefs about nightmares

University Library Heidelberg May 23, 2019 Michael Schredl, Louisa Holyba, Tina Köllmer et al. 12 citations

The diagnosis of a nightmare disorder is based on clinically significant distress caused by the nightmares and, therefore, empirical research should focus on studying factors that affect nightmare distress in addition to nightmare frequency. Overall, 2056 persons (1212 woman, 844 men) completed the online survey. A reliable 6-item scale measuring beliefs about nightmares was developed. The...

DOI: 10.11588/ijodr.2019.2.62531 (opens in new tab) Nightmare Distress Psychoeducation Clinical psychology +1

Dream content analysis using Artificial Intelligence

University Library Heidelberg June 26, 2018 Patrick Mcnamara, Kelly Duffy-Deno, Tom Marsh et al. 11 citations

We developed a dream content analysis system (DCAS) based on an artificial intelligence (AI) algorithm that was trained using a relatively large corpus of over 35,000 dreams. This sample of dreams were supplied by 424 female and 211 male users over 4 years who had posted them at the dream posting website and app Dreamboard.com. Building upon previous dream content ontologies developed by Hall,...

DOI: 10.11588/ijodr.2019.1.48744 (opens in new tab) Dream Content measure theory Negative mood Content analysis +3

Depression and Psychosis- Perspectives on the Body, Enactivism, and Psychotherapy

University Library Heidelberg May 28, 2018 Adrian Spremberg 2 citations

This article will discuss how the ‘enactive’ approach to cognition and psychological processes can help further clarifying and developing a more heuristic framework for the understanding of severe mental disorders, in this case, depression and schizophrenia. Furthermore, enactivismwill serve as a framework that comprehends depressions and schizophrenia as disorders that encompass three...

The Relationships Between Dream Recall, Motivation to Remember Dreams, and Waking Memory Ability

University Library Heidelberg April 27, 2018 Anthony Bloxham 1 citation

Dream recall ability can vary between and within individuals, dependent on a number of influencing factors, including personality dimensions, number of nocturnal awakenings, and attitudes towards dreaming. Only a few studies, however, consider the possible connection of dream recall ability to general waking memory ability, or the influence of being motivated to actively remember dreams. The...

Efficacy of the combination of cognitive training and acoustic stimulation in eliciting lucid dreams during undisturbed sleep - a pilot study using polysomnography, dream reports and questionnaires

University Library Heidelberg April 9, 2018 Gulshan Kumar, Arun Sasidharan, Bindu M Kutty 9 citations

Lucid dreaming is a unique state between dreaming sleep and waking, wherein one is aware of being in dream and able to control dream contents. The present study was aimed as a proof-of-concept to a previously proposed idea that combining a cognitive training protocol with auditory cue during sleep could cause effective lucid dreaming induction even among healthy participants who had no history...

Effects of lucid dream induction on external-rated lucidity, dream emotions, and dream bizarreness

University Library Heidelberg December 23, 2017 Sophie Dyck, Nina Kummer, Nina König et al. 4 citations

Lucidity is a rare phenomenon, thus different induction techniques are used to increase the frequency of lucid dreaming. The aim of the present study was to investigate the effect of lucid dream induction (three different cognitive methods: Dream diary, Wake-up-back-to-Bed, and reality testing/reflection) on external rated lucidity, dream length, overall emotional tone, and bizarreness....

The interpretation of independent agents and spiritual content in dreams

University Library Heidelberg November 17, 2017 Andrew Paquette 4 citations

Mystical experiences and spiritual dreams have been studied to learn how to define them, who has them, and why. Rarely is the content taken seriously except as evidence of physical or psychological pathology, religious beliefs, or the influence of local culture. A challenge posed by spiritual dream content and mystical experiences in general, is that spiritual experiences refer exclusively to...

Can we induce lucid dreams? A pharmacological point of view

University Library Heidelberg November 11, 2017 Firas H. Bazzari 3 citations

The phenomenon of lucid dreaming, in which an individual has the ability to be conscious and in control of his dreams, has attracted the public attention, especially in the era of internet and social media platforms. With its huge popularity, lucid dreaming triggered passionate individuals, particularly lucid dreamers, to spread their thoughts and experiences in lucid dreaming, and provide a...

Dreaming and REM-sleep: History of a scientific denial whose disappearance entailed a reconciliation of the neuroscience and the cognitive psychological approaches to dreaming

University Library Heidelberg November 8, 2017 Jacques Montangero 12 citations

Since around 2010, important changes occurred in research on the neural bases of dreaming. From the 1960s until the end of the century, most sleep physiologists and some dream researchers continued to adhere to the view that rapid eye movement (REM) sleep was the functional state of the brain concomitant to dreaming, in spite of numerous published findings falsifying that view. At the beginning...

Dreaming in Vienna: Analyzing dreams of Arthur Schnitzler and Sigmund Freud

University Library Heidelberg August 19, 2017 Franziska Beuerle, Michael Schredl

The goal of the present study was to analyze the dreams of Arthur Schnitzler and explore the dream content for potential parallels or differences to what is known about his private life in order to test the continuity hypothesis of dreaming. In addition, Freud’s dream content was also analyzed in order to compare Freud’s and Schnitzler’s dreams. One hundred dream reports from Schnitzler and 34...

Reflective awareness and cognitive abilities in dreams: Implications for lucid dream research

University Library Heidelberg July 26, 2017 Ming-Ni Lee 5 citations

Past research has suggested that reflective awareness in dreams, as a broader concept for understanding the phenomenon of lucid dreaming, can be further differentiated into a five-factor model (i.e., lucid mindfulness, dual perspectives, depersonalization, intra-dream self-reflection, and willed appearances) (Lee, 2010; Lee & Kuiken, 2015). Past research has also indicated that two kinds of...