Why do you suggest that the noise during sleep should be between 35 and 50 decibels?

It is best to sleep in a quiet situation. The decibel value is generally 20-30 decibels, because there is no absolute 0 decibel value, so you can hear your heartbeat. The decibel value of 35 -50 decibels is still a little high, and most people will be affected and can't sleep. A value of 50 decibels is equivalent to a normal discussion sound.