How many decibels of noise affect sleep?

Decibel, decibel is the size unit of sound pressure level (symbol: db). Every time the sound pressure doubles, the sound pressure level increases by 6 decibels. 1 dB is the sound that the human ear can just hear. Generally speaking, sounds below 20 decibels are considered quiet. Of course, generally speaking, sounds below 15 dB can be considered "dead". 20-40 decibels is about a whisper in a couple's ear. 40-60 decibels belong to our normal conversation voice. Above 60 decibels, it belongs to the noisy range. When it reaches 70 decibels, we can think it is very noisy and begin to damage the auditory nerve. Above 90 decibels will damage hearing, and stay in the space of 100- 120 decibels. Unless there is an accident, people will be deaf for a minute. Among them, the noise of cars varies from 80- 100 decibels. Take a car with a noise of 90 decibels as an example. At a distance of 100 meters, noise of 8 1 decibel can still be heard (the above standards will vary according to environmental differences, not absolute values).

(1) Noise interferes with sleep. Humans spend nearly 1/3 of their time in sleep. Sleep is an important condition for human beings to eliminate fatigue, restore physical strength and keep healthy. However, environmental noise can make people unable to sleep or wake up. In this respect, the elderly and patients are more sensitive to noise interference. Sleep is disturbed, and work efficiency and health will be affected. The results show that continuous noise can accelerate the rotation from deep sleep to shallow sleep, make people dream more and shorten the time of deep sleep; Sudden noise will wake people up. Generally speaking, 40 decibels of continuous noise can affect 10% of people; 70 decibels can affect 50%; Sudden dynamic noise can wake up 10% people at 40 decibels, and 70% people at 60 decibels. Long-term interference with sleep can cause insomnia, fatigue, memory loss, and even neurasthenia syndrome. In high noise environment, the incidence of this disease can reach more than 50-60%.

(2) Interference of noise on language communication The influence of noise on language communication comes from the influence of noise on listening. This kind of influence, from low communication efficiency to damage people's language listening. Research shows that the environment below 30 decibels belongs to a very quiet environment, such as radio studios, hospitals, etc., which should meet this condition. 40 decibels is a normal environment, such as the average office to maintain this level. 50-60 decibels belong to a noisy environment. At this time, mental work is affected and conversation is also disturbed. When making a phone call, it is difficult to talk when the ambient noise reaches 65 decibels; 80 decibels, I can't hear you clearly. When the noise reaches 80-90 decibels, the distance is about 0. 15 meters, and the conversation can only be carried out if the voice is raised. If the noise decibel is higher, it is almost impossible to have a dialogue.

According to the above, sleep quietly, of course, and about 30 decibels is the best.