The present study investigated the parameters of nocturnal sleep that mediate the relationship between morningness-eveningness preference and the sleep architecture of naps in university students. This study had a cross-sectional, descriptive correlational design. The sleep architecture of 52 students invited to take an afternoon nap in the laboratory was recorded. The morningness-eveningness q...

Chronotype is a characteristic of a person in a certain point of one's lifetime and it slowly changes with age. Adolescents start to go to bed later while schools impose early starting hours, which may become a problem for students who are unable to adapt their circadian rhythm. The aim of this study was to determine if differences in school starting times affect the students' chronotype, schoo...

Recent reports highlight that human decision-making is influenced by the time of day and whether one is a morning or evening person (i.e., chronotype). Here, we test whether these behavioral effects are associated with endogenous biological rhythms. We asked participants to complete two well-established decision-making tasks in the morning or evening: the matrix task (an ethical decision task) ...

STUDY OBJECTIVES This study examines the relevance of self-reported morning and evening chronotypes in treatment-seeking insomniacs presenting to a tertiary sleep clinic setting. DESIGN Using a cross-sectional design, patients were categorized as morning, intermediate, and evening chronotypes based upon scores on the Morningness-Eveningness Composite Scale (MECS). Group comparisons were made ...

Abstract Chronotypes are diversely associated with sleep quality and mental health. Eveningness is generally lower increased risk for health complaints. Along insomnia symptoms, frequent dysphoric dreams might be key elements of disturbed sleep, may also indicate psychological imbalance. Our cross-sectional online study aimed to examine whether eveningness can considered as an independent facto...

OBJECTIVE Chronotype refers to the time of the day that a person's physical and cognitive functions are active. Simply this is a circadian phase preference of a person. While some of the people are morning active (so called larks) others are more active at nights (The owls). The study of circadian rhythms, known as chronobiology, is all about the metabolic and psychiatric differences between pe...

Objective: This research was conducted to identify the relationship between chronotypes of nurses working in shifts and quality their lives.
 Methods: The sample that designed as a descriptive study comprised 267 shifts. data were collected with survey form, Morningness–Eveningness Questionnaire, Short-Form Health Survey (SF-36).
 Results: As per breakdown by chronotype, 68.9% interme...

background variations in diurnal preferences for activity and sleep are classified as morning and evening chronotypes. morning and evening-type individuals differ regarding a number of psychological and biological variables such as sleep. objectives the current study aimed to investigate the relationship between chronotypes and sleep quality. patients and methods in this descriptive, correlatio...

Background and Objective: Recent studies have shown a relationship between energy regulation and the circadian rhythm at behavioral, molecular, and physiological levels. The present study investigated the effect of chronotype on meal timing and obesity in Iranian housewives. Materials and Methods: This cross-sectional study was carried out using a convenience-sampling method through the partic...