Introduction. The association of sleep apnea syndrome (SAS) in patients with diabetes mellitus type 2 (DMT2) worsens the evolution of diabetes by increasing cardiovascular disease morbidity and mortality. Material and methods. The descriptive study includes 210 patients: 150 with DMT2 and 60 without DMT2, hospitalized in the „Timofei Mosneaga” Clinical Hospital. The STOP-BANG and EPWORTH questionnaires were used. Results. According to the STOPBANG questionnaire, in DMT2 patients 56,6% (23,3% women; 33,3% men) have a high risk for SAS; 31,3% (18% women; 13,3% men) have an intermediate risk and 12,1% (8,7% women; 3,4% men) have a low risk. In patients without DMT2, according to the STOP-BANG questionnaire: 26,6% (10% women; 16,6% men) have a high risk for SAS; 38,4% (11,7% women; 26,7% men) have an intermediate risk and 35% (28,3% women; 6,7% men) have a low risk. According to the EPWORTH questionnaire 72% (35,4% women; 36,7% men) of DMT2 patients have daytime sleepiness; 2,6% (2% women; 0,6% men) severe daytime sleepiness and 25,4% (12,7% women; 12,7% men) absent daytime sleepiness. In patients without DMT2, according to the EPWORTH questionnaire, 68% (33,3% women; 35% men) have daytime sleepiness, 32% (16,7% women; 15% men) absent daytime sleepiness. Conclusion. Most patients with diabetes have high (menpredominated) and intermediate risk for SAS; and those without diabetes – intermediate and low. Daytime sleepiness was present in both groups of patients.