From an op-ed in today’s New York Times: Our capacity to tune out noises — a relatively recent adaptation — may itself pose a danger, since it allows us to neglect the physical damage that noise invariably wreaks. A Hyena (Hypertension and Exposure to Noise Near Airports) study published in 2009 examined the effects of aircraft noise on sleeping subjects. The idea was to see what effect noise had, not only on those awakened by virtual fingernails raking the blackboard of the night sky, but on the hardy souls who actually slept through the thunder of overhead jets.
The findings were clear: even when people stayed asleep, the noise of planes taking off and landing caused blood pressure spikes, increased pulse rates and set off vasoconstriction and the release of stress hormones. Worse, these harmful cardiovascular responses continued to affect individuals for many hours after they had awakened and gone on with their days.