Simor P, B athori N, Nagy T, Polner B. Poor sleep quality predicts psychotic-like symptoms: an experience sampling study in young adults with schizotypal traits Objective: Psychotic-like experiences (PLEs) are unusual experiences such as perceptual abnormalities and delusional-like thoughts that resemble the symptoms of psychosis at the sub-clinical level. PLEs are associated with sleep complaints in healthy and clinical samples; however, evidence for day-to-day associations between poor sleep and subsequent PLEs under naturalistic conditions is scarce. We hypothesized that poor sleep quality would predict next days' PLEs, and vice versa, daytime PLEs would be associated with worse subsequent sleep quality. Method: Seventy-three university students with moderate to high levels of positive schizotypy participated in an experience sampling study. Participants rated their sleep each morning, as well as PLEs and affective states during the day over 3 weeks. Results: Multilevel regression models indicated that poor sleep quality predicted increased PLEs the following day. Poor sleep was linked to negative daytime mood that partially mediated the associations between sleep quality and next days' PLEs. Furthermore, PLEs were enhanced in the evening as compared to daytime reports. The prediction of poor sleep quality by previous days' PLEs was negligible. Conclusions: The results are consistent with the position that sleeprelated interventions might reduce the risk of psychosis, especially in individuals that tend to experience psychotic-like phenomena and negative affect.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Significant Outcomes• Poor subjective sleep quality and short sleep predicted next days' psychotic-like experiences.• More psychotic-like experiences during the day predicted lower sleep quality the following night to some extent, but explained only a negligible portion of the variance.• The temporal associations between sleep quality and psychotic-like experiences were partially mediated by negative mood. Limitations• Sleep quality was measured by self-report questionnaires.• Lack of objective measures (e.g., actigraphy) of sleep quality. • High ratio of female participants.

Due to the COVID-19 pandemic, populations from many countries have been confined at home for extended periods of time in stressful environmental and media conditions. Cross-sectional studies already evidence deleterious psychological consequences, with poor sleep as a risk factor for impaired mental health. However, limitations of cross-sectional assessments are response bias tendencies, and the inability to track daily fluctuations in specific subjective experiences in extended confinement conditions. In a prospective study conducted across three European countries, we queried participants (N = 166) twice a day through an online interface about their sleep quality and their negative psychological experiences for two consecutive weeks. Focus was set on between-and within-person associations of subjective sleep quality with daytime experiences such as rumination, psychotic-like experiences, and somatic complaints about the typical symptoms of the coronavirus. Results show that daily reports of country-specific COVID-19 deaths predicted increased negative mood, psychotic-like experiences and somatic complaints during the same day, and decreased subjective sleep quality the following night. Disrupted sleep was globally associated with negative psychological outcomes during the study period, and a relatively poorer night of sleep predicted increased rumination, psychotic-like experiences, and somatic complaints the following day. This temporal association was not paralleled by daytime mental complaints predicting relatively poorer sleep quality on the following night. Our findings show that night-to-night changes in sleep quality predict how individuals cope the next day with daily challenges induced by home confinement.

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Due to the COVID-19 pandemic, populations from many countries have been confined at home for extended periods of time in stressful environmental and media conditions. Cross-sectional studies already evidenced deleterious psychological consequences, with poor sleep as a risk factor for impaired mental health. However, limitations of cross-sectional assessments are response bias tendencies, and the inability to track daily fluctuations in specific subjective experiences in extended confinement conditions. In a prospective study conducted across three European countries, we queried participants (N = 166) twice a day through an online interface about their sleep quality and their negative psychological experiences for two consecutive weeks. Focus was set on between-and within-person associations of subjective sleep quality with daytime experiences such as rumination, psychotic-like experiences, and somatic complaints about the typical symptoms of the coronavirus. Results show that daily reports of country-specific COVID-19 deaths predicted increased negative mood, psychotic-like experiences and somatic complaints during the same day, and decreased subjective sleep quality the following night. Disrupted sleep was globally associated with negative psychological outcomes during the study period, and a relatively poorer night of sleep predicted increased rumination, psychotic-like experiences, and somatic complaints the following day. This temporal association was unidirectional since daytime reports of negative mental experiences were not associated with poor sleep quality on the following night. Our findings show that night-to-night changes in sleep quality predict how individuals cope the next day with daily challenges induced by home confinement

Introduction Insomnia and Nightmare disorder are the two most common comorbid sleep disturbances in psychotic conditions. However, insomnia and psychotic symptoms are umbrella terms that hide the heterogeneity of these concepts. Several studies have found that worsening sleep quality is associated with the strengthening of psychotic symptoms. Until now, there was less interest in the relationship between the specific insomnia symptoms (trouble with falling asleep, fragmented sleep, early awakenings, daytime consequences) and the specific dimensions of schizotypy (disorganization, unusual perceptual experiences, anhedonia, and impulsive nonconformity). Objectives The study aimed to depict the network structure of insomnia, dreaming features (dream recall/bad dream/nightmare frequency), and schizotypy dimensions. Methods Exploratory network analysis was conducted on cross-sectional data of the general population (N=1419, 77 % female). We modeled the interrelations between insomnia symptoms (Athens Insomnia Scale), dreaming features (the frequency of dream recall/bad dreams/nightmares), and the dimensions of schizotypy (OLIFE-S). Results show a highly connected network with strong stability. The nodes of schizotypy, insomnia, and dream feature perfectly correspond to their own clusters, but the nodes were also densely connected between the three clusters. Disorganization, frequent awakenings, and nightmares are the most central nodes of the clusters. The node of frequent nightmares seems to be the bridge symptom in this network which connects unusual experiences dimension and frequent awakenings. Conclusions These results suggest that specific dimensions of schizotypy and specific sleep complaints are differently connected. However further research is needed to investigate the finer details of these heterogenic phenomena. Disclosure No significant relationships.