That's according to a new study by the American Academy of Pediatrics.
The study suggests high schools and middle schools should start no earlier than 8:30 in the morning.
The average start time across the country is 7:59 in the morning, but only 15 percent of schools meet the recommendation.
Some districts say logistical issues do not allow an earlier start time.
"In some situations we have older siblings taking care of younger siblings," said Justin Harrell, an Associate Superintendent with the Springfield Public School District. "There are issues with the affect of activities and athletics and those issues of after school programs."
About 70 school districts across the country have moved their start time back to accommodate more sleep.
The study says a later start time improves academic performance and can decrease driving accidents among teens.