Sleep is a biological process that operates according to day and night cycles. This self-regulatory system is universal in all organisms, including humans and mammals. For this reason, the topic is widely analysed in the existing literature; however, no studies about chronobiological types of teenagers have been conducted in Lithuania before. 253 schoolchildren, 13 to 18 years of age, were surv...

This study investigates the usefulness of morningness-eveningness and emotion dysregulation for better understanding of social anxiety dimensions. Specifically, associations between morningness-eveningness and incremental validity of emotion dysregulation as a predictor of social anxiety were examined. Data were obtained from a sample of normal students (N=510). Results of regression analyses s...

Abstract Online activities and problematic online behaviors have recently emerged as important research topics. However, only a few studies explored the possible associations between these morningness-eveningness. The authors examined whether eveningness predicts distinct differently directly or via mediators. three different (problematic Internet use, gaming, social media use) were among large...

AIMS/INTRODUCTION 'Morningness' and 'eveningness' represent the sleep-wake patterns of the circadian rhythm might also affect glycemic control in patients with type 2 diabetes. The aim of this study was to examine the relationship between the morningness-eveningness trait and metabolic parameters. MATERIALS AND METHODS The study participants comprised 101 Japanese male workers with type 2 dia...

The purpose of this study was to evaluate homeostatic and circadian sleep process in 'larks' and 'owls' under daily life conditions. Core body temperature, subjective sleepiness and waking electroencephalogram (EEG) theta-alpha activity (6.25-9 Hz) were assessed in 18 healthy men (nine morning and nine evening chronotypes, 21.4 +/- 1.9 years) during a 36-h constant routine that followed a week ...

BACKGROUND The relationship between circadian disruptions and depressive disorders is a topic of great interest in contemporary psychiatry. Circadian rhythms include all physiological processes displaying a period around 24 hours. Sleep/wake cycles, body temperature, hormone secretion and other functions are subjected to person's individual circadian rhythm. Circadian typology includes three ch...

There is growing evidence that alterations in the intrinsic circadian clock and sleep might affect the aging process. The rhesus monkey (Macaca mulatta) provides unique opportunities to explore the role of the clock in successful and unsuccessful physiological and cognitive aging in a diurnal primate with consolidated nighttime sleep, complex cognitive functions, long life span, and phylogeneti...

Inter-individual differences in the phase of the endogenous circadian rhythms have been established. Individuals with early circadian phase are called morning types; those with late circadian phase are evening types. The Horne and Ostberg Morningness-Eveningness Questionnaire (MEQ) is the most frequently used to assess individual chronotype. The distribution of MEQ scores is likely to be biased...

Between childhood and adulthood, we go through puberty and adolescence. While the end of puberty is defined as the point of cessation of bone growth (epiphyseal closure; girls: 16 y; boys: 17.5 y), the end of adolescence (∼ ∼19 y) is defined less clearly, by a mixture of physical, psychological, social, and mental measures [1]. One conspicuous property of adolescence is the apparently unsaturab...