Tears in the eyes when patients fall asleep may be caused by lid ectropion, tear duct stenosis, conjunctivitis and other reasons. 1. Blepharophimosis: mainly refers to the eyelid margin turning outward away from the eyeball, the lid conjunctiva is often exposed to varying degrees, often combined with incomplete closure of the eyelid fissure, etc., which is mainly manifested as tearing, dry eyes, photophobia, etc., so the patient’s tearing in his sleep may be caused by blepharophimosis. 2. Lacrimal stenosis: Lacrimal stenosis refers to the organic stenosis that occurs in the junction of tear duct, lacrimal canaliculus, lacrimal sac and nasolacrimal duct as well as the lower orifice of nasolacrimal duct, which is often manifested as tearing and accompanied by itching of the eyelid skin and other conditions. 3. Conjunctivitis: Conjunctivitis is an inflammatory disease that occurs in the conjunctiva, which may cause symptoms such as photophobia and tearing, foreign body sensation in the eyes, etc. In addition, sleepy tearing may be caused by conjunctivitis. It is recommended that patients seek timely medical examination to clarify the cause of the targeted treatment, pay attention to eye hygiene in life, avoid rubbing the eyes with your hands and so on.