Sleeping tears may be caused by physiological reasons, but also may be caused by pathological reasons, such as narrowing of the tear duct, the presence of inflammation in the eye, and so on. 1. Physiological reasons: sleep tears may be caused by prolonged use of the eyes, such as playing with cell phones for a long time, resulting in excessive eye fatigue, there will be symptoms of watering eyes. 2. Pathological causes: it may be caused by narrowing of the tear ducts, such as the presence of tumors in the eyes, eye trauma and other reasons, leading to deformation of the nasal structure, so that the tear ducts are blocked and the symptoms of tearing occur. It may also be caused by inflammation of the eye, such as dacryocystitis, conjunctivitis, etc. These diseases have more tear secretion, and there are also symptoms such as stinging sensation in the eyes. Note: If the tears are occasional and there are no other symptoms, then no special treatment is needed and observation is sufficient. If it always occurs, accompanied by other symptoms, must go to the hospital in time.