Circadian Typology and its Sleep - Wake Cycle Temporal Pattern Related in University Students

Introduction: Circadian typology is related to the sleep-wake timing. Objective:To determine the circadian typology and to assess the sleep-wake timing associated with it in a sample of university students. Methodology:273 university students were evaluated by the Morningness Eveningness Questionnaire (MEQ) and the Munich Chronotype Questionnaire (MCTQ). The MEQ established the independent circadian typology variable and allowed the creation of three work groups: morning type (MT), indeterminate type (IT) and evening type (ET). The dependent variables were calculated from the MCTQ, we used sleep onset and sleep duration on days with classes and days free (SOW, SOF, SDW and SDF respectively), we also calculated the average weekly sleep duration (SDweek), the sleep debt (Sloss) and the social jetlag (SJL).In order to evaluate the phase of entrainment of sleep wake cycle (SWC)we determined two variables: midpoint sleep on free days (MSF) and midpoint of with sleep corrections (MSFsc).Results:183 subjects (67%) were classified as IT, 65 subjects (23.8%) as MT and 25 subjects (9.2%) as ET. The means of SOW, SOF and SJL were significantly different (p