Staying up late and using your eyes for a long time leads to eye muscle spasms, eye surface diseases, eyelid swelling and other manifestations, which make your eyes look smaller, and usually can be restored after enough sleep. 1. When you stay up late for a long time with your eyes open, the eye muscles contract for a long time, which leads to spasms, eye muscle weakness, and when you open your eyes, the levator muscle is weak, making your eyes look smaller. Usually improve sleep, refuse to stay up for a period of time after the muscle recovery, the eyes return to their original state. 2. Long-term eye opening leads to eye surface tear film instability, manifested as dryness, foreign body sensation, corneal conjunctival congestion, etc. Squinting can appropriately alleviate the phenomenon of dryness that leads to the inability to see things for a long period of time, and therefore the eyes look small. Suggested drops of artificial tears to replace the tear gland secretion of tears to relieve dry eye. 3. Staying up all night will also cause eyelid capillary expansion, soft tissue swelling, etc., manifested as eyelid swelling, eye smaller. After enough sleep, the swelling disappears and the eyes look like they are back to their original size. Sufficient sleep after staying up late can also be superimposed on massage, hot compresses and other techniques, a period of time can be self-recovery. Once the symptoms worsen, it is recommended to go to the hospital in time.