1. The sound of footsteps is generally 5-6 decibels, especially at night. The main reasons are that the floor is too thin, the floor structure is not sound-proof, the floor material is not sound-proof, the walking habit and Xiong Haizi's intention, and some sounds of running and jumping are also attributed to footsteps.

second, drag the desk and chair, 4-7 decibels, which is characterized by sudden and short duration, but the friction sound has strong penetration and is easy to be awakened when sleeping. Most of the reasons are the living habits of the residents upstairs.

Third, the falling sound, 4-9 decibels, comes suddenly without warning, with great vibration, which is very easy to wake people who are sleeping. Occasionally, it may be an accident, but if it happens frequently, it is also a living habit problem of the upstairs residents, which has a great relationship with Xiong Haizi.

Fourth, the voice, 4-5 decibels, can be heard more obviously in the dead of night, with less influence, but for people who have already had neurasthenia on the noise upstairs, the voice is also a more important noise, mainly in psychological influence.

5. The noise of the sewer, 4-6 decibels, comes from the sewer of the bathroom. If the bathroom is close to the bedroom, the noise will be more obvious, mainly the noise of the water flushing the toilet upstairs and flushing the pipeline.

6. The sound of playing the piano is 5-9 decibels. Generally, children practice the guzheng, drum set, piano, violin and other musical instruments. If a child practices musical instruments upstairs or in a neighboring house, and his house is not soundproofed, the noise caused by musical instruments is particularly loud, especially drum set and piano, which have the ability to penetrate through multiple walls, and both upstairs and downstairs will be affected.

7. Other noises, such as switch sound, outdoor air conditioner and other man-made noises.