Why do you suddenly quiet down when you sleep? . . .

People themselves have a natural adaptability to the environment. When they adapt to the noisy environment, they are in a state of sleep, and noise itself is a state of balance. The environment suddenly becomes quiet, and people still want the environment to be noisy because of inertia, but the sudden change of the environment makes people feel what happened during sleep, so they will wake up.

In fact, at this time, the sleeper cannot judge whether the environment is changing from noisy to quiet or from quiet to noisy. As long as the surrounding environment changes (including cold and hot changes, sound changes, tactile changes, etc.). ), may wake up.