Relationships have been reported between sleep, impulsivity, emotional states, and sunlight. Some studies associated sleep disturbances to depressive states, as well as insomnia to impairments in people's quality of life, while others supported a negative correlation between sleep quantity and impulsivity. Given that results vary significantly across studies more studies are needed. Considering the differences across Argentina in terms of sunlight, our study aimed to explore if there is an association between sleep, impulsivity, sunlight exposure and emotional states in Ushuaia (USH) and Metropolitan Area of Buenos Aires (AMBA) in December and May. The hypotheses were: (1) optimal sleep quantity and quality are negatively correlated to impulsivity, (2) there is an inverted U-shaped correlation between sunlight exposure and positive emotional states, and lastly, (3) there is an inverted U-shaped correlation between sleep quantity and positive emotional states. Thirty adults from USH and AMBA, completed online questionnaires and a cognitive task. Results showed that in May USH had higher depression levels than December while sleeping more than AMBA, associating more sleep to depressive states. Keywords: sleep, impulsivity, emotional states, sunlight exposure References https://doi.org/10.1016/j.sleep.2015.04.026 https://doi.org/10.1016/j.physbeh.2016.06.003 https://doi.org/10.19080/PBSIJ.2018.09.555768