Children can wake up with swollen eyelids, which may be caused by physiological factors, or mosquito bites, blepharitis and other causes. 1. Physiological factors: the child woke up with swollen eyelids, may be too much water before going to bed, the night long crying or stay up all night caused by physiological eyelid swelling. If there is no other discomfort, generally do not need special treatment. 2. Mosquito bites: children wake up with swollen upper eyelids, may also be caused by mosquito bites, children in the sleep if the mosquito bites the upper eyelids, venom into the skin will produce an allergic reaction to redness and swelling, but also itchy eyes and other discomforts. 3. Blepharitis: If a child wakes up with a swollen upper eyelid that is accompanied by tenderness or blinking pain, it may be caused by blepharitis, and as the condition develops, an eyelid abscess will form. It is recommended that patients with significant eyelid swelling seek medical attention to evaluate their condition and treat it under the guidance of a physician.