<unk>  <unk>  is the most common sleep-related breathing disorder and is characterized by recurrent episodes of complete or partial obstruction of the upper airway leading to reduced or absent breathing during sleep. These episodes are termed<unk> s" with complete or near-complete cessation of breathing, or "hypopneas" when the reduction in breathing is partial. In either case, a fall in blood oxygen saturation, a disruption in sleep, or both may result. A high frequency of<unk> s or hypopneas during sleep may interfere with restorative sleep, whichin combination with disturbances in blood oxygenationis thought to contribute to negative consequences to health and quality of life. The terms<unk>  syndrome <unk> S) or<unk> –hypopnea syndrome <unk> HS) may be used to refer to<unk>  when it is associated with symptoms during the daytime (e.g. excessive daytime sleepiness, decreased cognitive function). Most individuals with<unk>  are unaware of disturbances in breathing while sleeping, even after awakening. A bed partner or family member may observe an individual snoring or<unk> r to stop breathing, gasp, or choke while sleeping. Individuals who live or sleep alone are often unaware of the condition. Symptoms may be present for years or even decades without identification, during which time the individual may become conditioned to the daytime sleepiness, headaches and fatigue associated with significant levels of sleep disturbance.<unk>  has been associated with neurocognitive morbidity, as well as a link between snoring and neurocognitive disorders.
Obstructive sleep apnea
Sleep apnea
Central sleep apnea
Obesity hypoventilation syndrome
Hyperventilation syndrome
Sleep-related breathing disorder
Central hypoventilation syndrome
Reactive airway disease