Obesity is a critical factor in the development of sleep-disordered breathing (SDB). Snoring is the most frequent nocturnal symptom suggesting a diagnosis of SDB. Other common nighttime symptoms include snorting, gasping, choking, coughing, and witnessed apneas. The most frequent diurnal symptom in SDB is excessive daytime sleepiness. Patients suspected of having SDB should undergo a full night of in-laboratory polysomnography or in-home oligosomnography. SDB includes a spectrum of disorders; the most common are obstructive sleep apnea and central sleep apnea.