Research reveals high school students start classes too early and suffer consequences of not getting enough sleep.
"It's really hard to wake up and I feel really tired and I'm an everyday coffee drinker now," student Haley Brunkal said.
The Vacaville Unified School District believes starting classes later than 7:50 a.m., will improve the academic outcome of their students.
Students say 40 minutes of extra sleep makes a difference.
The school board has looked at the research, which revealed younger kids get up earlier and older students don't.
"So the sleep cycle doesn't start until 11 o'clock at night and the wake cycle is more like about 9 in the morning," Vacaville Chief Academic Ofc. Mark Frazier said.
The teachers union says most of its members want what's best for kids, but admits this change will affect the personal and work schedules of some of them.
The district said it will work with teachers.