Objective: To assess the interaction of chronotype with anxiety in patients with chronic primary insomnia. Methods: Sixty-four patients (50 women) with mean age 43.9±8.1 years were investigated with the Horne and Östberg Morningness-Eveningness Questionnaire (MEQ) and State-Trait Anxiety Inventory (STAI). Results: Significant negative correlations of chronotype-MEQ score with STAI state-anx...

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 = - ...

Brain recovery after prolonged wakefulness is characterized by increased density, amplitude and slope of slow waves (SW, <4 Hz) during non-rapid eye movement (NREM) sleep. These SW comprise a negative phase, during which cortical neurons are mostly silent, and a positive phase, in which most neurons fire intensively. Previous work showed, using EEG spectral analysis as an index of cortical sync...

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...

Introduction: Arterial hypertension (AH) coexists with such conditions as obesity, insulin resistance/hyperinsulinemia and dyslipidemia, that is, interrelated metabolic disorders characterize the syndrome (MS). The aim of study was to establish relationships between components MS chronotype, level daytime sleepiness, dispositional optimism in patients AH. Methods: included 42 diagnosed stage 2 ...

Heritable variation in the timing of rhythmic events with respect to daily time cues gives rise chronotypes. Despite its importance, mechanisms (clock or non-clock) regulating chronotypes remain elusive. Using artificial laboratory selection for divergent phasing emergence adults from pupae, our group has derived populations Drosophila melanogaster which are early and late eclosion rhythm. Seve...