Introduction: Sleep is essential for maintaining quality of life and well-being. Sleep disorders can negatively affect a healthy sleep pattern, and in war fighters, they are often a consequence of post-traumatic stress. Objective: This study aims to determine the presence of sleep disorders in combatants who experienced traumatic events in war. Materials and Methods: This cross-sectional study, conducted from September 2014 to July 2017, involved male war veterans aged 60 to 85 years, who experienced traumatic war events. The sample was collected in the Combatants League, supervised by the Ministry of National Defence, in Abrantes, Castelo Branco, Entroncamento, Tomar, and Torres Novas. The protocol included four questionnaires: sociodemographic, PCL-M, ESS, and PSQI. Out of 50 initial participants, 42 completed the study. Data were analysed using SPSS® version 24.0. Results: The correlation between PSQI and PCL-M was moderately positive (p < 0.002; r = 0.460). Findings revealed that 62% of combatants had sleep disturbances, 43% did not sleep the recommended hours, 81% used medication to sleep, and 26% took over 30 min to fall asleep. Among the participants, 15 showed severe PTSD symptoms (PCL-M scores 44–85), with 11 scoring above 50. Conclusion: Combatants exposed to traumatic war events exhibit significant changes in sleep quality. Identifying and treating sleep disorders in veterans should be prioritized, as these issues can impact their overall health and responsiveness.