A report in the American Journal of Preventive Medicine suggests city traffic does keep people awake, affecting sleep. That can lead to serious health consequences including risk for heart attack and high blood pressure.
Nighttime noise can also lead to insomnia and daytime sleepiness.
This study, conducted in the Atlanta, Georgia, area is the latest to raise a warning about noisy city areas.
Researchers say it is time for more extensive research and policies aimed at controlling nose problems in urban communities.