Sudden gasping for air while falling asleep at nap time may be obstructive sleep apnea syndrome, acute asthma attack, and cardiogenic factors, which are usually treated by medication and surgery. The cause of the disease should be identified in a timely manner. 1. Obstructive sleep apnea syndrome: enlarged tonsils, tongue hypertrophy, etc. can cause obstructive sleep apnea syndrome, which may be accompanied by rhinitis, sinusitis, etc., which manifests as snoring, open-mouth breathing and breathlessness during sleep. Rhinitis and sinusitis can be treated by medication, tonsillar hypertrophy and deviated nasal septum can be treated by surgery, and breathing machine can be worn when necessary. 2. Acute asthma attack: when an acute asthma attack, the patient will be out of breath, and need to be timely anti-inflammatory asthma, rapid relief of symptoms. Generally through drug treatment, such as albuterol aerosol. Drugs must be applied under the guidance of a doctor. 3. Cardiac factors: coronary heart disease, angina pectoris, and arrhythmia and other diseases, can cause sudden shortness of breath, must be immediately contained in the fast-acting heart pill, compound danshen drip pill and other drugs, timely hospitalization, symptomatic treatment. Suddenly out of breath during nap time, you should consult a doctor in time, ask the doctor to clarify the specific cause, and if necessary, carry out appropriate treatment.