Upper airway resistance syndrome (UARS) is a condition in which the upper airway becomes partially blocked during sleep, leading to breathing difficulties and disrupted sleep patterns. Symptoms include snoring, gasping for air, and daytime fatigue. There are several synonyms for UARS, including obstructive sleep apnea, upper airway resistance, and sleep-disordered breathing. These terms all describe similar conditions in which the airway becomes obstructed during sleep, leading to breathing difficulties and disturbed sleep. Treatment for UARS typically involves lifestyle changes (such as weight loss or smoking cessation) and the use of breathing aids such as Continuous Positive Airway Pressure (CPAP) machines.