Failure of humidification bottle Usually, people&;s hypoxia has the following important manifestations: increased breathing times, difficulty breathing, chest tightness, suffocation, cyanosis of lips and nail bed; The heart beats faster; Due to the strengthening of anaerobic glycolysis, the level of lactic acid in the body increases, which often leads to fatigue and fatigue. Lack of concentration, poor judgment and memory; Sleep disorder at night, decreased sleep quality, drowsiness during the day, dizziness, headache and other symptoms.