Deprive

Teenagers are some of the most sleep deprived people in the U.S. On average, teens do not get enough sleep, and more important, they do not get enough quality sleep, researchers say. We could blame cell phones and other light-emitting technologies for keeping kids up at night, but late nights are just part of the equation. In addition to technology, one fairly indisputable factor contributes to this collective sleepiness: school start times.
—The Scientific American