The current dissertation examined gender, cultural, and ontogenetic dimensions in the dreams of Canadians. Normative studies in the United States, Europe, and other countries have documented normative data including gender differences and compared their findings to American data to investigate cultural differences. The purpose of the present study was to extend research of this nature by establishing normative data for Canadians. Furthermore, age differences in dreams have been mostly investigated for females, with only a few studies with males, and have used a variety of methodologies and age ranges. Another objective of this study was to document, for the first time, the ontogenetic pattern of the main dream content categories from adolescence to old age for males and females. The rigorous and detailed dream diary method was used to collect dreams which were analyzed using the Hall and Van de Castle method of content analysis. The first paper consisted of two dreams each from 150 male and female young adult Canadians, ages 18-24, totaling 600 dream reports. Findings provided support for the threat simulation theory as there were more negative than positive themes overall. Furthermore, dream gender differences were consistent with those in waking and the similarity of Canadian and American culture was reflected in dream imagery, supporting the continuity hypothesis of dream formation. The final two papers examined the ontogenetic patterns of dream content for females and males respectively. The second paper consisted of 75 females across 5 age groups from adolescence to old age (12-17, 18-24, 25-39, 40-64, and 65-85) and the third paper consisted of 50 males across the same age groups with the exception of 31 males in the oldest group (65-85). The ontogenetic patterns of dream content from adolescence to old age reflected waking developmental patterns as proposed by social theories, neurobiological research, and recognized features of aging, supporting the continuity hypothesis. In terms of the theoretical implications, this work provides support for the hypothesis of the threat simulation theory pertaining to the prevalence of negative content in dreams. It also provides support for the continuity between waking and dreaming hypothesis of dream formation. Implications of these findings regarding our understanding of the sources of dream formation are described. Finally, limitations and future directions, for research examining the evolution of gender differences across the lifespan, are discussed.

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The objectives of this study were to explore (a) the relationships between dream reflective awareness and different types of impactful dreams, (b) the relationships between waking reflective awareness and dream reflective awareness following loss and trauma, and (c) the self-transformative potential of reflective awareness within dreams. We conducted a 2 (loss/trauma experiences) X 3 (timeframe: within the preceding 6 months, within the preceding 6-24 months, within the preceding 3-7 years) cross-sectional study to examine reflective awareness within impactful dreams and the changes in subsequent waking reflective awareness. The major results suggested that (a) only transcendent dreams were highly related to explicit dream lucidity (i.e., lucid mindfulness); (b) a continuity between pre-dream waking mindfulness and intra-dream self-awareness was specific to mundane dreams; (c) the experiences of loss or trauma and the timeframe of such experiences both predicted depersonalization within dreams; and (d) depersonalization within dreams was predictive of subsequent decreases in waking mindfulness. In sum, the present study replicated prior studies of the self-transformative effects of impactful dreams, demonstrated the continuity between dreaming and waking reflective awareness, and clarified the ways in which reflective awareness within dreams may affect post-traumatic growth.

Emotions are a central part of our lives and the ability to effectively regulate them is central to well-being. Although a lot of research shows the beneficial role of sleep on emotional reactivity and regulation, little is known about how dream emotions relate to emotional reactivity and regulation. The current study investigated how dreams with high vs low levels of self-rated negative dream affect related to next-day waking emotional reactivity and regulation. Participants kept a home dream diary until reporting dreams on five days. They also reported dream and wake emotions and performed an online emotional reactivity and regulation task. Opposing predictions were derived from the continuity hypothesis and from the emotion regulation theories of dreaming. However, no significant differences were found between emotional reactivity and regulation on mornings following dreams with high vs low negative affect. Thus, no support was provided for the direct predictions made from the two theories. Nevertheless, morning wake affect differed significantly as a function of dream emotions. Specifically, participants reported significantly higher levels of positive emotions on mornings after a dream low, rather than high, in negative affect. Similarly, wake morning negative affect was higher following dreams high, rather than low, in negative affect. Thus, the results support a form of affective continuity between dreams and morning wakefulness.

Bien que des émotions soient rapportées dans une vaste majorité de rêves, nous en savons encore peu sur les facteurs qui expliquent les variations d’une nuit à l’autre et d’une personne à l’autre dans l’expérience affective des rêves. Nous avons examiné la relation entre des variables de trait et d’état à l’éveil en testant des modèles multiniveaux destinés à prédire la valence affective des rêves de tous les jours. Des participants de la population générale ont complété des mesures de personnalité et d’historique de traumatismes, suivies de trois semaines de questionnaires quotidiens sur leur rappel de rêves, la valence des émotions rêvées, ainsi que leurs niveaux de stress perçu dans la journée et avant le coucher. Les effets intra-individuels étaient responsables d’une majorité de la variance en valence émotionnelle des rêves. L’anxiété de trait était la seule variable à prédire de façon statistiquement significative la valence émotionnelle des rêves au niveau inter-individuel. En accentuant le besoin de mesures plus affinées dans ce domaine de la recherche sur les rêves, nos résultats font ressortir des limites et biais méthodologiques associés à l’estimation rétrospective de l’affect général à l’éveil et en rêve, en plus de mettre en évidence des variables d’état qui pourraient mieux expliquer la variance intra-individuelle des émotions vécues dans les rêves de tous les jours. / Although emotions are reported in a large majority of dreams, little is known about the factors that account for night-to-night and person-to-person variations in people’s experience of dream affect. We investigated the relationship between waking trait and state variables and dream affect by testing multilevel models intended to predict the affective valence of people’s everyday dreams. Participants from the general population completed measures of personality and trauma history followed by a three-week daily journal in which they noted dream recall, valence of dreamed emotions, as well as their level of perceived stress for the day and prior to sleep onset. Within-subject effects accounted for most of the variance in the reported valence of dream affect. Trait anxiety was the only variable that significantly predicted dream emotional valence at the between-subjects level. While highlighting the need for more fine-grained measures in this research field, our results point to methodological limitations and biases associated with retrospective estimates of general dream and waking affect, and bring into focus state variables that may best explain observed within-subject variance in emotions experienced in everyday dreams.

Bien que les rêves dysphoriques, comme les mauvais rêves et les cauchemars, surviennent du moins occasionnellement chez la majorité des adultes, les facteurs impliqués dans l’occurrence de ces rêves, d’une nuit à l’autre, demeurent incertains. Par le biais d’un devis prospectif multiniveaux, nous avons étudié l’impact interactif des facteurs d’état et de trait sur l’occurrence de rêves dysphoriques d’une nuit à l’autre. Nous avons également exploré dans quelle mesure le contenu affectif et négatif des rêves de tous les jours était affecté par les mêmes facteurs. Des femmes adultes ont complété des mesures de trait de personnalité et de psychopathologie suivies de jusqu’à quatre semaines de journaux quotidiens de rêves et d’anxiété avant le coucher, ainsi que d’inventaires hebdomadaires de stress perçu. En contrôlant pour le rappel de rêve, une hausse hebdomadaire du stress perçu a significativement augmenté la probabilité d’avoir un rêve dysphorique une nuit donnée, alors que la psychopathologie a modéré positivement cette relation. Ces résultats suggèrent que les femmes adultes ayant un niveau plus élevé de psychopathologie seraient particulièrement sensibles au stress quotidien et donc plus susceptibles de faire des mauvais rêves ou cauchemars les nuits suivantes. Les analyses ont aussi révélé des effets positifs différentiels des variables d’état et de trait sur le contenu émotionnel et négatif des rêves de tous les jours. Ces résultats concordent avec le modèle neurocognitif des rêves dysphoriques proposé récemment et l’hypothèse de continuité des rêves. Les implications de cette étude et des recommandations futures sont émises. / Although disturbing dreams, such as bad dreams and nightmares, are experienced at least occasionally by a majority of adults, the factors involved in the night-by-night occurrence of these dreams remain unclear. Using a prospective design and multilevel modeling, we investigated the interactive impact of state and trait factors on the nightly occurrence of disturbing dreams. We further explored the extent to which emotionally intense and negative everyday dream content was affected by the same variables. Adult women completed measures of personality and psychopathology followed by up to four weeks of daily dream logs, daily pre-sleep anxiety logs, and weekly perceived stress inventories. After controlling for dream recall, upsurges in weekly perceived stress significantly increased the likelihood of having a disturbing dream on a given night, whereas psychopathology positively moderated that relationship. These results suggest that adult women reporting higher levels of psychopathology are particularly sensitive to everyday stress and thus more likely to experience bad dreams or nightmares on subsequent nights. Analyses also revealed differential positive effects of state and trait variables on the emotional and negative content of everyday dreams. These findings are in line with a recently proposed neurocognitive model of disturbed dreaming and the continuity hypothesis of dreaming. The implications of this study and future recommendations are emitted.