Children waking up with swollen eyes may be due to drinking too much water, infections, kidney disease and so on. 1. Drinking too much water: drinking too much water before going to bed, the body can’t absorb the water completely, resulting in local edema, can sleep wake up with swollen eyes. 2. Infection: Bacterial or viral infection can cause redness, swelling, heat and pain in the eyelids, triggering inflammation of the eyes, or even granuloma, which can lead to swollen eyes. 3. Kidney disease: acute glomerulonephritis, nephrotic syndrome, etc., are abnormal kidney function, can cause different degrees of eyelid swelling, urinary abnormalities, etc., and children may appear to urinate less. There may be other reasons for children waking up with swollen eyes, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.