(WWJ) -- With most kids in Michigan heading back to school this week, some people think it could be time to start considering a later start to the school day.

Avondale Interim School Superintendent Rick Repicky said there is research that shows high school students do better when they get more sleep. But he added that changing the schedule would cause challenges for younger students.

"If you start you high schools later and you're in a school that buses the students, then we all are cut back to the point where we have a minimum number of buses, we rotate those buses around in the general cycle of high school first, middle school second, elementary third," Repicky said. "We don't have enough buses to take all of the kids at the same time."

Repicky said that flip-flopping schedules with high school and elementary students would make the younger kids walk to school in the dark, something most parents would not like.

"There are a lot of good ideas, but there is a real difficulty sometimes implementing them," Repicky said. "You can do a lot of things with start time when you're not responsible for driving a third to half of your students to the school site."

The idea of year-around school -- getting rid of the long summer break -- has also been a topic of discussion.

"The elementary kids are on a different schedule than your middle school and high school kids," Repicky said. "Parents balk at that because it messes up their vacation time during the school breaks."