AIM: To investigate the sleep quality in elderly patients with obstructivesleep apnea syndrome (OSAS) . METHODS: 54 cases of elderly patientswith OSAS were evaluated by the pittsburgh sleep quality index (PSQI)questionnaire. RESULTS: Among 54 OSAS patients, 35 cases (65%) re-ported poor quality of sleep, only 7(13% ) cases reported good. A signifi-cant negative correlation was found between apnea/hypopnea index (AHI)and PSQI, and part of its components. CONCLUSION: Elderly patientswith OSAS often complain of poor quality of sleep. Daytime dysfunction,poor subjective sleep quality, low habitual sleep efficiency and long sleeplatency constitutes the principal parts of the symptoms about sleep.