Among the consequences of shift work, there is a direct relationship with poor sleep quality, with the Public Security Police (PSP) agents being a possible target of this problem, as they experience this form of work. Objectives: Evaluate sleep quality in PSP agents, relating it to shift work. Materials and Methods: The sample consisted of 1877 Portuguese agents, 165 female and 1712 male. The collection took place in 2020, by answering an online form, which included a sociodemographic questionnaire, the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale to quantify sleep quality. Results: There was a predominance of poor sleep quality in the groups that work in shifts, with a higher percentage in those that always work in shifts. Good sleep quality prevails more in the group that never takes shifts. There was a higher prevalence of poor sleep quality in the group that reported working mainly in rotating/variable shifts. Taking into account the three periods (day/morning, afternoon and night), there is a higher prevalence of poor sleep quality in the group that refers to working more than one period of the day, with the night shift representing higher percentage of poor sleep quality. Discussion: The results of this study are consistent with the results of other investigations and are similar to other professionals who work in shifts, highlighting the negative impact shift work has no sleep and, consequently, on these workers health. Conclusions: For the study sample, shift work proved to be a deteriorating factor in sleep quality, with the rotating shift and the night shift being the ones with the highest prevalence of poor sleep quality.