Obstructive sleep apnea and hypopnea syndrome (OSA) is defined as a reduction or cessation of the airflow in the human airway. It effects nearly 18 million Americans and weight gain is the main predisposing factor. In this study, we aimed to investigate the effects of apnea and hypopnea individually. Material and Methods: 83 participants were included in the study and they are divided into two groups as apnea predominant or hypopnea predominant. Pittsburg quality of sleep index (PQSI) and

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... h sleepiness scale (ESS) are completed for all subjects and full-night attended polysomnographic evaluations are done. Results: ANOVA test was used to compare the inter-group variances. Between the two study groups, no statistical significance was reported between the PSQI or ESS scores. Conclusion: The effects of apnea and hypopnea are similar on sleep quality or day-time sleepiness, however further studies also investigating the duration of the events as well are needed.