Daughter 16 years old sleep sound at night, may be a normal physiological condition, or sleep apnea syndrome, sleep epilepsy and other pathological conditions. 1. Physiological: Sleeping noises are usually physiological conditions, such as snoring, sleep talking, teeth grinding, sleep-related moaning, which generally occurs in everyone, especially during REM sleep, which is characterized by dreaming. 2. Sleep Apnea Syndrome: Usually accompanied by snoring, the sounds made during sleep at this time are the cause of the disease. Sleep apnea can lead to a decrease in blood oxygen saturation, respiratory pause, and the occurrence of body hypoxia. 3. Sleep epilepsy: it refers to epilepsy that occurs during sleep, and there will be twitching and shouting of limbs. If physiological factors are ruled out, medical attention should be sought to clarify the cause.