Swollen eyes when baby sleeps up may be caused by physiological factors such as crying before bedtime, and may also be related to trauma, allergies and other pathological factors. 1. Physiological factors: if the baby cries before going to bed and rubs his eyes with his hands forcefully, it may cause the performance of swollen eyes when he sleeps. If the patient’s baby sleep by mosquito bites eyelids, can cause eyelid swelling, itching and other discomfort symptoms. 2. Pathological factors: baby head trauma, can appear subcutaneous hematoma, if the eyelids are involved, the patient may appear eyelid swelling discomfort symptoms. If the baby is allergic to dust mites, pollen and other substances, in the process of sleeping contact with allergens, thus triggering an allergic reaction, can also lead to eyelid swelling, can also be accompanied by eye itching and other symptoms. It is recommended that children with significant eyelid swelling should seek prompt medical attention to assess their condition and follow the doctor’s instructions.