This study focused on determining the relationship of sleep satisfaction and the academic performance of Grade 12 students in Talangan Integrated National High School, Nagcarlan, Laguna, S.Y. 2021-2022. The main reason why the researcher conducted this study is that many students nowadays do not perform well at school and she observed that maybe sleep deprivation is one of the reasons why. The quantitative method of research was followed. The respondents of this study were selected using the Slovin?s formula. The strands available in Grade 12 are GAS/ABM, ICT, CAREGIVING and AUTOMOTIVE. They answered a survey questionnaire to know how their sleep is related to their performance in school. The relationship was found to be significant using Pearson r proven by p value 0.00(alpha 0.05). From the survey, the researcher came up with the conclusion; there is a significant relationship between the sleep satisfaction and the academic performance of a student. Thus, obtaining good sleep at night results in significantly good academic performance at school.