Feeling chest tightness and shortness of breath when sleeping, mostly related to myocardial ischemia and cardiac insufficiency, as lying down will make the amount of returning blood have increased, easily increase the burden on the heart, will aggravate the lung stasis, will appear the symptoms of chest tightness and shortness of breath.
In addition, chronic respiratory diseases, such as chronic bronchitis, bronchial asthma, bronchial dilation, or prolonged work stress or mental depression can also lead to symptoms of chest tightness and shortness of breath during sleep. If it does not resolve on its own, prompt medical consultation is recommended to clarify the cause.