I have windows at home and live on the first floor. I feel very noisy when I sleep at night. How to do sound insulation? Please enlighten me ... I always wake up.

There is a difference between sound insulation and sound absorption. Sound absorption solves the problem that the main space sound source is reflected and the original sound is distorted. The method is to reduce the amount of sound reflection in the main space. Sound insulation solves the problem that the sound source propagation affects the space outside the sound source. The main way is to reduce the propagation energy of sound source and prevent the propagation path of sound source. The sound-absorbing board should be equipped with sound-absorbing felt or cotton to achieve sound-insulating effect.