The relationship of meal habits and alcohol/cigarette consumption to circadian typology and sleep health in Japanese female students was studied from an epidemiological point of view. Questionnaires on Morningness-Eveningness by Torsvall and Akerstedt (1980), sleep habits, regularity of meal intake and meal amount, and style of alcohol and cigarette consumption were administered to 800 students...

Morningness-eveningness or chronotype changes significantly throughout the life span. This has been reported for the transition during adolescence in some studies, and to a lesser extent in early adulthood. Primary and pre-school children have been under investigation in fewer studies. This is the first comprehensive study covering the age range from very young children until early adulthood (0...

The Composite Scale of Morningness (CSM) is a psychometrically sound instrument available in several languages, including French, aimed at arranging individuals along a continuum from high "eveningness" to high "morningness." On the other hand, impulsivity is involved in many personality disorders and is thought to be orthogonal to venturesomeness, which can be seen as a component of the broade...

We examined the psychometric properties and construct validity for the Morning Affect (MA) scale; this scale is a subset of the morningness factor from the Composite Scale of Morningness (CSM). We also addressed some problems with this literature. First, we employed an older working sample that was not gender biased. Second, we argued whether self-reported dependent variables that are used to a...

The main areas studied until the 70s were fatigue and rest. Many tests for fatigue were examined, and studies failed to find their practical use. Fatigue grows according to the positive acceleration curve while recovery grows according to the negative acceleration curve. Different mechanisms are involved in intelligence test performance when subjects are fatigued and when rested. Contrary to th...

Shift work tolerance is a term describing the ability to adapt to shift work without adverse consequences. In this paper we systematically review literature published investigating the relation between individual differences such as age, gender, personality, morningness/eveningness as well as biological variables and different measures of shift work tolerance from 1998 till 2009. A total of 60 ...

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...

Recently, interindividual differences in tolerance to shift work have become an increasing interest in chronobiological shift work studies.1) A number of factors have been investigated2) such as sex, age, general health status, quality and quantity of sleep, internal desynchronization between body temperature and sleep-wake cycle, morningness-eveningness, introversion-extroversion, job satisfic...

The PER2 gene has been reported to influence diurnal preference. In this study, we have attempted to characterize the associations between the PER2 gene polymorphisms and diurnal preference in a population of healthy young subjects, controlling for the social and environmental confounding factors. Subjects were 299 students in a college, carefully selected to be mentally and physically healthy....