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Sleep-disordered breathing encompasses a spectrum of conditions from simple snoring to severe obstructive sleep apnea. At one end, primary snoring occurs without significant airway obstruction or oxygen desaturation. Upper airway resistance syndrome represents a middle ground where increased breathing effort disrupts sleep quality without meeting the full criteria for sleep apnea. Obstructive sleep apnea involves repeated complete or partial airway collapse with measurable drops in blood oxygen, classified as mild, moderate, or severe based on the number of events per hour.

The health consequences of untreated sleep apnea extend far beyond poor sleep quality. Each apnea episode triggers a cascade of physiological stress responses including surges in blood pressure, heart rate, and stress hormones. Over months and years, this nightly stress takes a toll on the cardiovascular system. Sleep apnea increases the risk of hypertension by two to three times, doubles the risk of stroke, and is an independent risk factor for atrial fibrillation and heart failure. The metabolic effects include insulin resistance, contributing to type 2 diabetes and weight gain, creating a vicious cycle.