Noise while you are sleeping can significantly raise your blood pressure, even when it does not wake you up, a new study suggests.

Researchers monitored 140 generally healthy men and women ages 45 to 70 as they slept near four European airports. They used electronic devices to monitor blood pressure and to measure noise levels from airplanes, traffic and indoor sounds. Noise incidents varied from 5 decibels, roughly the sound of a quiet room, to more than 90 decibels, the equivalent of a loud stereo.

Science Times