Most people sleep with their eyes closed, and only a few people sleep with their eyes open, as the saying goes. "Sleeping with your eyes open" is medically called eyelid dysfunction during sleep. Most people who "sleep with their eyes open" are morbid, which may cause harm to their eyes after a long time. A small number of people are not morbid and have no influence on eye health and daily life. The opening and closing of eyes are coordinated by some muscles of eyes and face, among which the most important is the coordinated contraction and relaxation of levator palpebrae superioris and orbicularis oculi: levator palpebrae superioris contracts, orbicularis oculi relaxes and eyelids open; The orbicularis oculi muscle contracts, the levator palpebrae superioris relaxes and the eyelids close. When the two can't work harmoniously, it is possible that even in sleep, the eyelids will continue to open, that is, "sleeping with your eyes open." What's the harm of sleeping with your eyes open? Under normal circumstances, the surface of eyeball is covered with a relatively immobile tear film, which keeps the surface of cornea and conjunctiva lubricated and provides nutrients needed by epithelium. When sleeping, people's eyes naturally close, and the tear film can completely cover the surface of the eyeball, protecting the cornea and conjunctiva. During sleep, patients with "sleeping with eyes open" suffer from eye diseases due to long-term eyelid insufficiency, liquid on the eyeball surface evaporates, conjunctiva and cornea lose the moisturizing and protective effects of tear film, and are exposed and constantly stimulated by the outside world. This is why some patients with incomplete eyelid closure are prone to feel dry, burning and foreign body sensation. In addition, "sleep with eyes open" patients have shallow sleep, poor ability to eliminate interference during sleep, and are sensitive to external stimuli, so their sleep quality is poor and they are prone to neurasthenia symptoms such as fatigue and memory loss. Non-pathological "sleep with eyes open" does not need treatment, but for pathological "sleep with eyes open", especially for patients with severe eyelid insufficiency, in order to avoid serious complications, different treatments can be given according to different causes. If it causes cicatricial ectropion, it can be corrected; Eyelid defect caused by trauma can be reduced by plastic transplantation or eyelid margin suture. In order to keep the corneal surface moist, those with severe eyelid insufficiency can wear hydrophilic soft contact lenses as appropriate and close the eyelid margin if necessary.