Symptoms of<unk>  are similar to those of obstructive sleep apnea, but not inherently overlapping. Fatigue, insomnia, daytime sleepiness, unrefreshing sleep, anxiety, and frequent awakenings during sleep are the most common symptoms. Oxygen desaturation is minimal or absent in<unk> , with most having a minimum oxygen saturation >92%. Many patients experience chronic insomnia that creates both a difficulty falling asleep and staying asleep. As a result, patients typically experience frequent sleep disruptions. Most patients with<unk>  snore, but not all. Some patients experience hypotension, which may cause lightheadedness, and patients with<unk>  are also more likely to experience headaches and irritable bowel<unk> . Predisposing factors include a high and narrow hard palate, an abnormally small intermolar distance, an abnormal overjet greater than or equal to 3 millimeters, and a thin soft palatal mucosa with a short uvula. In 88% of the subjects, there is a history of early extraction or absence of wisdom teeth. There is an increased prevalence of<unk>  in east Asians.
Upper airway resistance syndrome
Central hypoventilation syndrome
Obesity hypoventilation syndrome
Hyperventilation syndrome
Reactive airway disease
Eustachian tube dysfunction
Cardiac asthma
Yokkaichi asthma