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Social jet lag is associated with contemporary lifestyle with harmful impacts on health, predisposing individuals to obesity, diabetes, cardiovascular diseases and cognitive impairment. Knowing that this condition is influenced by chronotype and that these are reflected in rhythmicity markers, a better understating of mechanisms and factors related to this condition are helpful to raise awareness to the society, to prevent and treat its consequences. Our goal was to evaluate if chronotype has a moderating effect on social jet lag, investigate if activity-rest rhythm could be affected by social jet lag and whether it could be related to nighttime light exposure. Methods 13 subjects (10 women) aged between 23 and 59 years answered Morningness-Eveningness Questionnaire and record activity and rest rhythm by actimetry. Results We observed that chronotype is a predictor of social jet lag (p &amp;lt; 0.05) and eveningness leads to greater social jet lag. Sleep duration and time of sleep offset were higher on free days (p &amp;lt; 0.05) and, as expected, higher activity at night was related to greater social jet lag (p &amp;lt; 0.05). We did not find relation between level and time of exposure to light at night and social jet lag (p ≥ 0.05). None of these differences were chronotype-dependent. Conclusion Our work was one of the first that addressed the relationship between social jet lag and a rhythmicity marker, the activity-rest rhythm. We also demonstrated the importance of a better understanding of the evening types, that are more affected by social obligations. Support Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) e Associação Fundo de Incentivo à Pesquisa (AFIP).

0183 Social Jet Lag and Chronotype: Implications for Activity and Rest Rhythm and Light Exposure