I believe many people have experienced difficulty falling asleep. Excluding mental or physical diseases, an important reason affecting our sleep quality is the sleep environment. External sound stimulation is undoubtedly the main part of the sleep environment. When this stimulation is strong, it will inevitably make it difficult to sleep. Therefore, keeping a quiet and comfortable environment is beneficial to sleep.
However, why do we sometimes find it difficult to fall asleep in an absolutely quiet environment? That is because if there is no external sound at all, the tinnitus, dizziness, heartbeat, pulse and all kinds of fantasies in the brain that can not be detected at ordinary times will be highlighted and become troublesome. Without the interference of noise, there are more psychological and physiological problems, which makes it difficult for us to sleep.
California State University has a sound-absorbing soundproof room. A reporter named Paul bannisky specially went to the laboratory to "experience" this "absolutely quiet" environment. He described it this way: when entering the absolutely silent laboratory, the miscellaneous information brought by the outside world remained in his mind for the first few minutes, but he didn't care about the quiet environment. But a few minutes later, it was like falling into a huge black hole, which was frighteningly quiet. I can clearly hear the sound of my blood flowing in my blood vessels and the sound of my heart beating like a steam hammer. The "cluck" sound of bending arms is like a fracture, and the breathing sound of lungs makes people feel like being in a big bellows. If you move your body, it will make a sound almost tearing. In such an environment, people are so nervous that their hearts are almost jumping out. How can they sleep?
Therefore, it is not that the quieter the environment, the more conducive to sleep. Some residents who are used to living beside noisy roads will be unable to sleep because the environment is suddenly quiet when they move to a quiet community, which often takes some time to adapt.