In adolescence, a phase marked by physical, psychological, and social development, education is an important factor in the forming individual. This involves sleep habits, which influence academic achievement, health, and wellbeing. There is a phase delay in teens related to changes in the Processes C (circadian control), and S (homeostasis) of sleep regulation, causing later bedtimes and wake-up times. Sleep deprivation and irregularity in adolescents, which may be caused by the misalignment between sleep-wake rhythms and routine, can impair physical and mental health and academic achievement. Attention and memory are two cognitive processes that may be prejudiced. Commuting to school can affect sleep habits in adolescents both because of the impact on routine and the way they determine exposure to light and physical activity. Based on that, this project aims to analyze the relationship between the time and the means of commuting to school and the sleep-wake cycle, cognitive and academic performance of students in the first year of a technical high school. The study included 319 students aged between 13 and 18 y.o. (242 completed all stages) from a federal technical school in RN. Those who reported using psychotropic drugs or having some mental illness were excluded. Data collection was carried out in two units: Natal and Lajes. Sleep habits were assessed using the following questionaries: “Health and Sleep”, the Pittsburgh Sleep Quality Index, the puberty and phase preference scale and the pediatric daytime sleepiness scale in addition to the sleep diary and a pictorial sleepiness scale faces filled for 10 days during which the Continuous Performance Task and the Sternberg Task were applied to assess attention and working memory, respectively, a single time, between 7 and 8:30 am for students in the morning shift and 13 and 14:30, in the afternoon. Correlation tests, comparison between means and general linear models will be performed for data analysis.