A child’s hoarse voice just waking up from sleep may be caused by vocal corditis, colds, acute pharyngitis and other reasons. 1. Vocal chorditis: Improper use of the voice or long-term excessive use of the voice can cause vocal chorditis, if the child cries more frequently at night, excessive use of the voice can lead to congestion and swelling of the vocal cords, so that the child woke up with a hoarse voice. 2. Colds and flu: a cold at night can cause colds and flu, which can lead to coughing, congestion in the throat, and other symptoms, and the discomfort in the child’s throat can also lead to hoarseness in the child’s voice. 3. Acute pharyngitis: the mucous membrane of the throat is infected by germs that can cause acute pharyngitis, which manifests itself as dry, itchy and painful symptoms in the throat, making the child’s voice hoarse. When the child wakes up, parents can give the child a moderate amount of warm water to improve the discomfort of the throat; if necessary, the child should be taken to the hospital, improve the relevant examination, clear the cause of the disease, under the guidance of the doctor according to the specific conditions of the symptomatic treatment.