Many patients who have chronic obstructive pulmonary disease (COPD) or asthma also have obstructive sleep apnea (OSA)—and vice versa. This review from Cleveland Clinic Journal of Medicine, available at http://www.ccjm.org/topics/obesity-weight-management/single-article-page/the-intersection-of-obstructive-lung-disease-and-sleep-apnea/dff50621172ad1329c163560b7f1b19b.html, explores the shared risk factors for sleep-disordered breathing and obstructive lung diseases, describes potential pathophysiologic mechanisms explaining these associations, and highlights the importance of recognizing and individually treating the overlaps of OSA and COPD or asthma.