Patients who have swollen eyes after going to bed may be caused by physiological reasons and may also be related to pathological reasons. 1. Physiological reasons: If patients drink more water before going to bed, resulting in increased water retention in the body, which can lead to edema in the eyes of patients. Poor quality of sleep or prolonged crying, patients may also have puffy eyes after waking up in the morning, which usually does not require special treatment and can be relieved after rest. 2. Pathological causes: If the pillow or quilt sleeping in poor hygiene and cleanliness, the eyes are susceptible to infection during sleep and acute inflammatory reaction of the situation, the patient may appear eye swelling, itching, pain and other symptoms of discomfort in the surrounding skin. It is recommended that patients with obvious eye swelling consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.