Alveolar aeration decreased | Hypoxaemia | Hypoxemia | Hypoxia | Hypoxic | Transient nocturnal oxygen desaturation | Refractory desaturation | Happy hypoxia | Silent hypoxia | Nocturnal oxygen desaturation | Nocturnal hypoxia | Oxygen Deficiency | Deficiency, Oxygen | Deficiencies, Oxygen | Oxygen Deficiencies | Anoxia | Anoxemia |