Vital Signs
Facts & Figures
Sounding the alarm about sleep
50 to 70 million
Number of U.S. adults with chronic sleep or wakefulness disorders
7 to 9
Hours of sleep a night recommended for adults
35%
Percentage of adults who sleep less than 7 hours a night
8.5 to 9.25
Hours of sleep a night recommended for teens
85%
Percentage of teens who sleep less than 8.5 hours on school nights
37%
Percentage of drivers who admit to having driven while drowsy at least once during the previous month
19
Hours of unbroken wakefulness at which one's impairment in reasoning ability equals that due to intoxication at a blood-alcohol level of .1%
1971
Year that DHMC's Sleep Center—one of the nation's first—opened
1,200
Number of accredited sleep centers in the U.S. today
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