NEW YORK (CBSNewYork) — Thousands of students and parents will get a rude awakening this week when alarm clocks ring and schools open their doors. And for many, a summer of sleeping in will be replaced with a wake-up call that feels like it’s coming in the middle of the night.

But there are some things that parents can do to make the transition a little easier.

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In an interview with CBS 2’s Andrea Grymes, Dr. Daniel Erichsen of the Center for Sleep Medicine said young children need 11 to 12 hours of sleep, and teenagers need nine to 11 hours.

“You’ve got to plan ahead, meaning it’s impossible to start waking up at 7 a.m. when you’ve been used to waking up at 11 a.m. for several weeks,” Erichsen said.

It takes about one day to adjust your sleep schedule by one hour, Erichsen said. So if children need to wake up four hours earlier than they are accustomed, it will take them four days to adjust, he said.

He also said that instead of parents enforcing earlier bed times, they should focus on setting earlier wake-up times.

For the full interview, click on the video above.

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