Girls who make a humming sound in their sleep may be caused by sleep dreaming, poor breathing, seizures and so on. 1. Sleep dreaming: dreaming while sleeping can easily lead to dreaming, which can lead to humming. 2. Poor breathing: it may be caused by nasopharyngeal diseases, such as rhinitis, nasal polyps, deviated septum, enlarged pharyngeal tonsils, etc., which may lead to snoring, humming or other sounds. 3. Seizures: most of them have a history of epilepsy in the seizure may appear humming sound, and accompanied by limb twitching. Girls who sleep with a humming sound may also be caused by other reasons, if the symptoms continue to be unrelieved, you should promptly consult a doctor to identify the cause of the appropriate treatment.