Noise from honking cars and police sirens can disrupt sleep, but it also may increase the chance of developing diabetes, according to a large study from Denmark. The researchers compared noise levels from road traffic to the incidence of diabetes in 57,000 people. As the noise levels increased, so did the risk for developing the disease. The risk increased by 8 to 11 percent for every 10-decibel (dB) increase in road noise. A decibel is a measure of loudness and intensity of sound.