A child’s muffled voice after waking up is usually due to physiological factors such as dry air and excessive use of the voice, as well as pathologic factors such as respiratory tract infections and acute laryngitis. 1. Physiological factors: the air in the house where the child sleeps is too dry, resulting in dry mucous membrane of the voice or excessive use of the voice, such as excessive crying, shouting, talking a lot, etc. may lead to mute voice after waking up, which is a normal physiological reaction. 2. Pathological factors: Respiratory tract infections caused by infections not only cause the child’s voice to be muffled after waking up, but also usually accompanied by coughing, runny nose and other symptoms. Acute laryngitis caused by acute bacterial or viral infections can also lead to a muffled voice after waking up. There may be other reasons for your child’s voice to be muffled after waking up from sleep, so it is recommended that you go to the hospital in a timely manner to have a complete examination to determine the cause of the illness, and then give targeted treatment or therapy under the guidance of the doctor.