Sleep data are gathered prior to administration of the well-known p-beauty contest game. Additionally, using a validated morningness-eveningness preference measure, morning-type and evening-type subjects are identified and randomly matched or mismatched into morning or evening experiment sessions. This design allows examination of the effects of voluntary sleep restriction and optimal/suboptima...

This study examined the impact of night shift on six dimensions of mood. The efficacy of a range of personality, behavioural, and social/organizational predictors of these responses was also examined. Thirty-five female student nurses were studied during their first period of night work. ANOVAs indicated that only fatigue-inertia and vigour-activity were significantly affected by night work. Mu...

This paper illustrates a psychometric approach of broad relevance to psychiatric research instruments. Many instruments include indicators related to more than one source of true-score variance due to the: (1) assessment of conceptually adjacent constructs; (2) the presence of a global construct underlying answers to items designed to assess multiple dimensions. Exploratory structural equation ...

STUDY OBJECTIVE The present study aimed to analyze season of birth effects on preferred sleep-wake cycle timing as assessed by Morningness-Eveningness Questionnaire (MEQ). PARTICIPANTS AND MEASUREMENTS The MEQ was administered to a sample of 5,720 university students (3,851 Italians and 1,869 Spaniards; 3,877 female and 1,843 male; mean age 22.23 +/- 2.98 years). RESULTS Females preferred t...

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...

Abstract Disturbed sleep is prevalent in adult populations and has been associated with negative health outcomes. This cross-sectional study assessed how psychological lifestyle factors relate to subjective quality university students. In a large ( N = 1114) sample of Dutch students we chronotype (Morningness-Eveningness Questionnaire), depressive symptoms (Quick Inventory Depressive Symptoms),...