"Short sleepers" can get just 4 hours a night and feel fine, but is their health at risk?

Paula Williams, a clinical health psychologist who studies sleep here at the University stated that there are an “amazing amount of gaps” in our scientific knowledge of sleep. Paula was quoted featured in an article about the number of hours of sleep Americans get. 

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Additional Coverage

Is 4 hours of sleep really enough?
Is sleeping just 4 hours a night a health risk?
“Sleep is overrated”