7 to 9 hours of nightly shuteye is best for adults
5% of the population can function normally on 4 hours' sleep
11 days The longest anyone has stayed awake
100,000 Number of annual car crashes in US related to fatigue
31% of drivers in the US report having fallen asleep at the wheel at some point in their lives
30% of US workers sleep less than 6 hours a night
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