BACKGROUND Rhythm disturbances are a frequent clinical manifestation of depression. In recent years a possible relationship between depression and chronotypes has emerged. Specifically eveningness has been proposed as vulnerability factor. The aim of this study was to describe sleep features of depressed patients according to chronotypes and to explore possible associations with the clinical fe...

Recently, it has been suggested that people’s chronotype is involved in regulating food intake and obesity. This study aimed to investigate the association between chronotypes with hormones related to appetite in adults in Tehran. Methods: This cross-sectional study was conducted on 353 men and women aged 18-60 years using convenience sampling in Tehran municipality community centers. Informati...

background and objective : morningness–eveningness (me) refers to the individual differences in diurnal inclination, sleep-wake pattern for activity, and vigilance in the morning and evening. quantitative and qualitative components of sleep can be measured through its quality. this study aimed to evaluate the association of me chronotype with sleep quality and insomnia in students. materials an...

OBJECTIVE The aim of this study was to identify chronotypes of medical students at the Federal University of Paraíba (UFPB) and its relationship to quality of sleep, daytime sleepiness, age, sex and season of birth. METHODS The final sample consisted of 221 students, assessed by four questionnaires: demographic questionnaire, Morningness-Eveningness Questionnaire (MEQ), Pittsburgh Sleep Quali...

The impact of diurnal preferences on health-related behaviors is acknowledged but relatively understudied. The aim of this study was threefold: (1) testing the measurement model of the Hungarian version of the reduced Horne-Östberg Morningness-Eveningness Questionnaire (Hungarian Version of the rMEQ); (2) estimating chronotypes and their prevalence; and (3) analyzing the relationship between mo...

Humans can be classified as early, intermediate and late chronotypes based on their preferred sleep wakefulness patterns. Eveningness is associated with increased risk of developing several psychiatric conditions, such major depressive addictive disorders, however, the anatomical basis chronotype distinctions, which might predispose to above remains largely unexplored. Using magnetic resonance ...

BACKGROUND   Two understudied risk factors that have been linked to emotional difficulties in adolescence are chronotype and sleep deprivation. This study extended past research by using an experimental design to investigate the role of sleep deprivation and chronotype on emotion in adolescents. It was hypothesized that sleep deprivation and an evening chronotype would be associated with decrea...

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 ...