Hannah Lommers-Johnson has attended Nathan Hale High School, nestled on the bank of Thornton Creek in the city's north end, for two years. She's drawn to world history, just discovered a passion for photography, and wants nothing to do with Occupational Ed, where students learn PowerPoint, and other digital-world survival tools. She'd rather read or play soccer. But next year, her junior year, she won't be back. The reason: Dad doesn't want her sleeping in.

At Nathan Hale, Hannah's erstwhile classmates will start classes a full hour later come September, at 8:45 a.m. And despite Mr. Lommers-Johnson's reservations, and the qualms of about 65 percent of Nathan Hale students, many of Hannah's classmates - and the nation's sleep researchers - are thrilled.

The dichotomous views epitomize the split over a growing experiment in American education. Thirty-eight school districts in 18 states have changed start times, according to the National Sleep Foundation, and another 108 districts are considering the switch. Opponents - including some teachers, administrators, most coaches, and many parents - balk at the change in routine, pointing out that children might still be sleeping when parents leave for work, and worrying that after-school sports and jobs will be squeezed for time. Proponents say the move could improve attendance, alleviate student depression, lower drop-out rates and the frequency of teenage car accidents, and eventually improve academic achievement.

When school starts at 7 a.m., the teenage brain is "still seeking to be asleep," says Kyla Wahlstrom, a researcher at the University of Minnesota's Center for Applied Research and Educational Improvement. "This isn't anything that's under the control of the students; it's something that has to happen ... to maximize the development of the brain."

Teens' sleep schedules, researchers say, are just different. After age 14, about 98 percent of adolescents have a chemical tendency to get sleepy around 11 p.m., and wake up around 8 or 8:15 a.m., as levels of the neurotransmitter melatonin fall.

For adults, the equivalent of an early-start school day would be a meeting at 4 or 5 a.m., says Mark Mahowald, Director of the Minnesota Regional Sleep Disorder Center. "We could function, but we wouldn't want to be making decisions that were important," he explains. "In essence, we're sending a very high percentage of our high school students to school in the last third of their sleep period."

And so, after six years studying the issue, Nathan Hale assistant principal Katherine Hutchinson is optimistic. "We hope we'll be like other districts who've done this and find that students will come to school more rested and able to participate more fully, be more alert," she says.

Nathan Hale's decision was inspired by Wahlstrom's research in Minneapolis, where public schools revamped their start times in the fall of 1997. As at Nathan Hale, many in Minneapolis opposed the change scooting high school start times from 7:15 to 8:40, and dismissal times from 1:45 to 3:30 p.m.

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