This empirical cross-sectional study explored the effect of chronotypes on classroom behaviour. One hundred and forty young Portuguese children, from 1st to 4th grades, were examined regarding their chronotype disruptive behaviours occurring in classroom. Three groups (i.e., morning, intermediate evening) identified. The Chronotype Questionnaire for Children evaluated Conners Scale - reduced ve...

Research examining various psychological correlates of circadian type (also known as diurnal preference) has been, over the years, quite expansive. A notable omission within this research program would appear a systematic exploration of the relation between intelligence and morningness-eveningness. The present study redressed this imbalance. 420 participants performed two self-report inventorie...

The relationship between diurnal preference, as measured by the Horne-Östberg questionnaire, and quantifiable personality traits was investigated in 620 participants. A hierarchical multiple regression demonstrated that conscientiousness was the single biggest predictor of diurnal preference (beta = 0.26), after controlling for depression, sleep disorders, shift work, age, gender, and demograph...

Abstract Introduction Significant changes to sleep occur during perinatal periods. Existing research focuses on duration and quality, but not timing or chronotype. This study investigated change trajectories of chronotype from late pregnancy two years postpartum, examined associations between insomnia, sleep-related impairment, mood at seven different time-points. Methods Data were a 2-arm rand...