Chronotype describes a person’s general preference for mornings, evenings, or neither. It is typically conceptualized as continuous unidimensional spectrum from morningness to eveningness. Eveningness associated with poorer outcomes across myriad of physical and mental health outcomes. This later sleep wake times increased risk depression, anxiety, suicidal ideation in both clinical community s...

In this study (N = 263) we provide a basic test of a niche-specialization hypothesis of the Dark Triad (i.e., narcissism, psychopathy, and Machiavellianism). We propose that in order to best enact a ‘‘cheater strategy’’ those high on the Dark Triad traits should have optimal cognitive performance and, thus, have a night-time chronotype. Such a disposition will take advantage of the low light, t...

This study explored whether circadian preference is related to students’ attitudes and choices to attend lectures or watch them online, and whether these variables relate to course performance. The subjects were 847 students enrolled in an introductory psychology course who completed an online survey that contained the Morningness – Eveningness Questionnaire and that ascertained their attitudes...

We report on results from an Internet survey of sleeping habits in a Dutch population using the Munich Chronotype Questionnaire (MCTQ), supplemented with the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ). The MCTQ was completed by 5,055 responders, of which 2,481 also completed the MEQ. MEQ score correlated well with the MCTQ assessment of time of mid-sleep on free days (MSF; r = - ...

Objective: Internet addiction and smartphone are emerging mental health concerns in adolescents. To determine the factors related to these conditions, we investigated their associations with sleep quality, chronotype, patterns, daylight exposure, depression, anxiety.Methods: Self-rated questionnaires, including Addiction Proneness Scale-Short Form, Smartphone Scale–short version, Insomnia Sever...

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...

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 ...

A circadian cycle is an endogenous, healthy process that regulates the of sleep and waking. disturbance could cause a number different health problems. Depending on their morning evening characters, people vary. By administering trans-adapted morningness eveningness questionnaires, purpose present was to assess various personality types. The study included total 300 participants, who were aged ...