The chronotype, which reflects the circadian rhythm preferences of individuals in their daily activities and sleep-wake cycles, can be considered on a dimension extreme morningism eveningism. Individuals with morning evening chronotypes face many physical psychological dangers due to accumulated sleep debt, short total time insufficient efficiency. In chronotypes, especially people, social jet-...

Grundy and colleagues (1) conducted a study into how light influencesmelatonin in nurses during rotating shifts. Inter alia, it was concluded that the examined "two-12hour-days/two-12-hour-nights/5-days-off" pattern minimally disrupts melatonin production. Interestingly, chronotype information was obtained but appeared to have negligible effects on shift-work–melatonin relationships. The author...

School system in which classes are scheduled 1 week in the morning and the other in the afternoon, and in which students rotate schedule every week, fosters sleep irregularity. In this study, we examined morningness-eveningness of adolescents who were involved in such schedule of school time and explored relationship between their circadian preferences and sleep characteristics. A large sample ...

We examined the relationship between dissociative experiences as indexed by the Dissociative Experiences Scale (DES; Bernstein & Putnam, 1986) and sleep-related experiences (e.g., nightmares, recurring dreams) as measured by the Iowa Sleep Experience Survey (ISES; Watson, 2001) in an undergraduate sample (N 1⁄4 94). In addition, we studied the link between dissociative experiences and sleeping ...

Humans show large differences in the preferred timing of their sleep and activity. This so-called "chronotype" is largely regulated by the circadian clock. Both genetic variations in clock genes and environmental influences contribute to the distribution of chronotypes in a given population, ranging from extreme early types to extreme late types with the majority falling between these extremes....

Abstract Disturbed sleep is prevalent in adult populations and has been associated with negative health outcomes. This cross-sectional study assessed how psychological lifestyle factors relate to subjective quality university students. In a large ( N = 1114) sample of Dutch students we chronotype (Morningness-Eveningness Questionnaire), depressive symptoms (Quick Inventory Depressive Symptoms),...

Humans come in different chronotypes and, particularly, the late chronotype (the so-called owl) has been shown to be associated with several health risks. A number of studies show that laboratory mice also display various chronotypes. In mice as well as in humans, the chronotype shows correlations with the period length and rhythm stability. In addition, some mouse models for human diseases sho...

Associations of eveningness with health hazards benefit from analyzing to what extent the polygenic score for morningness correlates assessments behavioral trait morningness-eveningness and chronotype. With a population-based sample 17,243 Finnish adults, aged 25–74 years, this study examines associations four feasible assessment methods chronotype, a) biological genetic liability based on (PGS...