That is estimated to cost the nation's economy more than $400 billion dollars per year.
A good night of sleep is between seven and nine hours.
But for those who sleep less than six hours, the risk of death, whether from illness or disease goes up 13 percent.
Out of the five countries studied Americans sleep the least... Followed by Japan.
For better sleep, researchers suggest doing more physical activity and staying off your phone or computer before bedtime.