Eyelid swelling in the morning may be caused by physiological factors, mosquito bites, acute conjunctivitis, eye allergies and other factors. 1. Physiological factors: children drink too much water before going to bed or sleep in the process of sleeping in an improper position, may lead to slow down the local blood circulation of the eyelids, will appear in the morning eyelid swelling symptoms, generally reasonable activities, eyelid swelling can be improved on their own. 2. Mosquito bites: at night when you sleep, indoor mosquitoes are more, if the child’s eyelid skin bites, can lead to eyelid swelling in the morning, may also be accompanied by conjunctival congestion, itching and other symptoms. 3. Acute conjunctivitis: Conjunctivitis may be associated with bacterial or viral infections and usually occurs acutely. When it occurs at night, it can cause children to have swollen eyelids after getting up in the morning, which may be accompanied by tearing and itching of the eyes. 4. Eye allergy: If the child is allergic to items such as pillowcases and duvet covers, the child may have swollen eyelids after waking up in the morning, accompanied by conjunctival congestion, pain, itching and other uncomfortable symptoms. It is recommended that children with visible eyelids seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.