A new study has found that people who were exposed to even moderate levels of aircraft noise were less likely to receive seven hours of sleep, the minimum recommended amount of sleep, each night.
Published in the journal Environmental Health Perspectives, the study by Boston University School of Public Health and Oregon State University found this risk increased among people living in the Western US, near a major cargo airport, or near a large water body, and among people with no hearing loss.
People who were exposed to airplane noise at levels as low as 45 decibels were more likely to sleep less than seven hours per night. For comparison, the sound of a whisper is 30 decibels, a library setting is 40 decibels, and a typical conversation at home is 50 decibels.
Sleep is essential to overall health and well-being, including daily physical and mental functioning, and a lack of adequate sleep can lead to increased risks of cardiovascular disease, depression, diabetes, cancer, and numerous other health conditions. Health experts state that most adults need seven to nine hours of sleep each night for healthy functioning.
Despite how common exposure to noise from aircraft is for many people, little is known about the health effects of aircraft noise, particularly in the US, according to study lead author Matthew Bozigar, PhD, assistant professor of epidemiology at Oregon State University, and study senior author Junenette Peters, ScD, associate professor of environmental health at Boston University School of Public Health.
“This study helps us understand the potential health pathways by which aircraft noise may act, such as through disrupted sleep,” says Peters in a release.
For the study, Peters, Bozigar, and colleagues from Boston University School of Public Health, Brigham and Women’s Hospital, Harvard Medical School, and Harvard T.H. Chan School of Public Health examined airplane noise exposure and self-reported sleep disturbance among more than 35,000 participants living around 90 of the major US airports. The participants were selected from the Nurses’ Health Study, an ongoing, prospective study of US female nurses who have completed biennial questionnaires since 1976.
The team examined aircraft noise levels every five years from 1995 to 2015, focusing on two measurements: a nighttime estimate that captures airplane noise occurring when people sleep and a day-night estimate (DNL) that captures the average noise level over a 24-hour period and applies a 10 decibels adjustment for aircraft noise occurring at night, when background noise is low. The DNL is also the primary metric that the Federal Aviation Administration uses for aircraft noise policies, and the threshold for significant noise impacts is above DNL 65 decibels. The team linked these measures at multiple thresholds with the nurses’ geocoded residential addresses.
After accounting for a range of factors, including demographics, health behaviors, comorbidities, and environmental exposures such as greenery and light at night, the results showed that the odds of sleeping less than seven hours rose as airplane noise exposure increased.
Short sleep duration was also more likely among nurses who lived on the West Coast, near a major cargo airport or a large body of water, as well as among nurses who reported no hearing loss.
“We found surprisingly strong relationships for particular subgroups that we are still trying to understand,” says Bozigar in a release. “For instance, there was a relatively strong signal between aircraft noise and both dimensions of disrupted sleep, short sleep duration and poor sleep quality, near major cargo airports. There is likely more going on to this story, as cargo operations tend to use larger, older, heavily laden, and therefore noisier aircraft that often fly through the nighttime hours. And the quantity of cargo shipped by air has been steadily increasing over the last couple of decades, possibly linked to more e-commerce. If the trends continue, it could mean more aircraft noise impacts to more groups of people.”
While the results suggested a clear link between airplane noise and sleep duration, the researchers observed no consistent association between aircraft noise and quality of sleep.
“Though we cannot recommend policy changes from the results from a single study, our study of around 90 US airports did reveal a connection between aircraft noise and getting less than the recommended amount of sleep,” says Bozigar in the release. “Current gaps in knowledge could be filled in the future by including additional demographic groups—such as children, men, minority groups—and more detailed metrics of aircraft noise rather than a nightly or 24-hour average in studies. There are also more detailed ways of measuring sleep than from self-reports, such as wearable activity monitors, like a Fitbit, that researchers are incorporating more frequently in studies. And we still need to design studies that include other common sources of transportation noise, such as from cars and trains, to determine the impact of each type on health.”