The causes of swollen eyes after a patient wakes up are as follows: 1, caused by drinking too much water at night; 2, poor sleep at night, insomnia, resulting in sleep deprivation, may also appear swollen eyes; 3, eye skin if contact with allergens causing allergic conjunctivitis, may also appear swollen eyelids, and may be accompanied by skin itching or foreign body sensation in the eyes; 4, caused by bacterial infection If a bacterial infection causes localized cellulitis or bacterial conjunctivitis, the inflammatory manifestations of localized redness, swelling, heat, and pain may also occur. 5. Chronic diseases such as heart disease, nephritis, and cirrhosis of the liver may also cause eyelid swelling. Therefore, when this occurs, further examination is needed to clarify the cause and to provide targeted treatment according to the cause.