6-year-old boy sleeping nose sound may be a symptom of certain diseases, such as rhinitis, adenoid hypertrophy, colds and so on. 1. Rhinitis: due to nasal mucosa congestion, edema, increased nasal secretions, there will be the performance of nasal congestion, sleep at night, due to the position and other factors, the nose when breathing is not smooth, the sound emitted by the larger, or snoring. 2. Adenoid hypertrophy: Nasopharyngeal adenoid hypertrophy, 6 years of age belongs to the hyperplasia period, there can be nasal congestion, nasal sound heavy performance, sleep with the nose whistling sound, or have obvious snoring, breath-holding symptoms. 3. Colds: can lead to acute congestion of the nasal mucosa, showing nasal congestion, sometimes accompanied by nasal discharge, aggravating breathing problems, and more pronounced sounds from the nose at night when lying on the back. All in all, it is recommended to consult a doctor in time for clear diagnosis and treatment of nose discomfort.