WebMD Medical News
Laura J. Martin, MD
March 3, 2011 -- About a third of adults in the U.S. may be getting less than seven hours of sleep per day, putting themselves at risk for serious health problems, according to two new CDC studies.
Who gets enough sleep and the consequences of insufficient shut-eye varies according to age, gender, ethnic group, educational level, and other factors, the studies indicate.
Both studies are published in the CDC’s Morbidity and Mortality Weekly Report for March 4, 2011.
In the first study, based on 2009 data from 74,571 adults in 12 states, 35.3% of adults reported getting less than seven hours of sleep in an average 24-hour period. The National Sleep Foundation recommends seven to nine hours of sleep per day for healthy adults.
Among the key findings:
Nodding off while driving apparently varies by age. Among people aged 65 or older, only 2% said they had fallen asleep at the wheel in the previous 30 days. But 3.1% of people ages 55 to 64 acknowledged nodding off while driving, compared to 3.9% for those 45-54. The study says 7.2% of adults 25 to 34 admitted falling asleep off while driving, the highest percentage of any age group.
Also, of the total sample, 5.8% of men said they nodded off while driving, compared to 3.5% of women.
“Drowsy driving, one of the most lethal consequences of inadequate sleep, has been responsible for an estimated 1,550 fatalities and 40,000 non-fatal injuries annually in the U.S.,” according to the authors of the first study. “Sleepiness reduces vigilance while driving, slowing reaction time and leading to deficits in information processing, which can result in crashes.”
Older people apparently get more sleep, the study also indicates. Only 25% of people 65 and over said they slept less than seven hours in a day. In contrast, 31% of people 18 to 24 reported sleeping less than seven hours in a 24-hour period.
Sleep time also seems affected by educational level, ethnicity, race, and employment status, the statistics suggest. For example:
Findings varied widely among the 12 states studied. For instance, 27.6% of people in Minnesota reported getting less than seven hours of sleep compared to 44% in Hawaii.
The second study, based on a different set of data, examined correlations between hours of sleep and six sleep-related issues: concentrating, remembering, working on a hobby, driving or taking public transportation, taking care of finances, and working.
Trouble concentrating apparently is the biggest problem for those adults getting less than seven hours of sleep. Specifically, 19.4% of people who slept seven to nine hours a day reported trouble concentrating, but 29.3% of those sleeping less than seven had concentration problems.
Among other findings:
The researchers conclude that the perceived difficulty of performing routine daily tasks may be as much as 50% greater among adults who sleep less than seven hours.
SOURCE:Morbidity and Mortality Weekly Report, March 4, 2011.
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