Morningness-eveningness, sleep-wake variables and big five personality factors

The aim of this study was to explore associations between chronotype and sleep-wake variables on the one hand and personality on the other in a large and gender balanced sample based on the big five inventory, encompassing the factors extraversion, neuroticism, openness, agreeableness and conscientiousness. 1231 participants (652 female, 579 male) responded to the composite scale of morningness (CSM) as a measure of chronotype and to a short version of the big five inventory (Rammstedt & John, 2007). Morningness correlated positive with agreeableness and conscientiousness, even when controlling for age and when examining gender separately. Neuroticism was related to eveningness only in females and in adolescents (10-17 years). In adults (18-47) only conscientiousness correlated with morningness. Positive correlations existed between agreeableness and conscientiousness and sleep length on weekdays and on weekends. Misalignment correlated significantly negative with agreeableness and conscientiousness but positive with extraversion. (C) 2008 Elsevier Ltd. All rights reserved.