On an average school night only about 8 percent of high school students get enough sleep, a new study has revealed.
Many others are living with borderline-to-serious sleep deficits that could lead to daytime drowsiness, depression, headaches and poor performance at school.
The study evaluated responses from 12,000 students in grades 9 through 12 who participated in the 2007 national Youth Risk Behavior Survey.
The authors found that 10 percent of adolescents sleep only five hours and 23 percent sleep only six hours on an average school night.
More females than males have sleep deficits as do more African-Americans and whites compared to Hispanics.
Nearly 20 percent more 12th-grade students have sleep deficits than do those in ninth grade.
The findings of this study were consistent with those reported from the National Sleep Foundation's 2006 Sleep in America Poll, the authors said.
They added that although no formally accepted sleep guidelines exist, the foundation defines nine hours a night as optimal for adolescents, eight hours as borderline and anything less than eight hours as not enough.
"The natural sleep-wake pattern shifts during adolescence, making earlier bed time and wake times more difficult. The result for students with early school start-times is a chronic sleep deficit," lead study author Danice Eaton, Ph.D., of the Centers for Disease Control and Prevention, said.