Sleep-disordered breathing (SDB) is common in patients with obesity and type 2 diabetes mellitus and is independently associated with hypertension, obesity, and cardiovascular disease. It has previously been shown that insulin resistance is related to the severity of SDB. Using a 72-hour continuous glucose-monitoring system and hemoglobin A1c (HbA1c) level measurements, Babu and colleagues evaluated the effect of treating SDB with continuous positive airway pressure (CPAP) in patients with type 2 diabetes mellitus. Continuous positive airway pressure treatment of SDB improved glycemic control. Furthermore, patients compliant with CPAP therapy demonstrated superior improvement in HbA1c and blood glucose levels compared with noncompliant patients. In compliant patients, the duration of effective CPAP treatment was significantly correlated with improvement in HbA1c level.