More severe asthma attacks before bedtime may be due to allergenic stimuli, neural mechanisms, and sleep position effects. 1. Allergen stimulation: asthma attacks and exposure to allergens (allergens), such as allergies to dust mites or pet hair, dander and so on. Bedroom bedding is a place with more dust mites, and many people will have pets on the bed, resulting in more animal hair on the bed. Lying down before going to bed exposed to these allergens, stimulate the respiratory tract, triggering asthma attacks. 2. Nervous mechanism: bronchial tubes and lungs are subject to the body’s sympathetic and parasympathetic dual innervation. Before going to bed at night, the body’s parasympathetic excitability increases and sympathetic excitability gradually decreases. Influenced by this nerve mechanism, bronchial spasm may occur more easily before going to bed, thus inducing asthma attacks. 3. Sleeping position: sleeping on the back, airway breathing resistance increases significantly, this situation is also easy to cause asthma attacks. Have a history of asthma, home to always have drugs, asthma once an attack as soon as possible with medication to relieve symptoms, serious cases as soon as possible to the hospital for treatment. If you always go to bed before a serious asthma attack, you can change the time of medication, take medication before going to bed to ease the problem of serious attacks before going to bed.