Turn off the lights upstairs. Can you hear me downstairs?

It may be abnormal to turn off the lights upstairs and hear them downstairs, which may indicate that the sound insulation effect of the building is not good. The reason may be:

1. The sound insulation facilities of the building are not perfect, or the sound insulation materials are not installed correctly.

2. The sound insulation facilities of the building may be damaged or aged during use, resulting in the reduction or failure of sound insulation effect.

3. There may be defects in the design of the building, such as insufficient floor thickness or unreasonable structure, which leads to sound propagation in the floor.

If this situation affects your life, you can consider communicating with your neighbors or reporting problems to the property and asking for improvement in sound insulation.